diff --git a/include/commodity.h b/include/commodity.h
index 46a038eb..c3757661 100644
--- a/include/commodity.h
+++ b/include/commodity.h
@@ -44,6 +44,7 @@ struct comstr {
     /* initial part must match struct empobj */
     short ef_type;
     short com_uid;
+    time_t com_timestamp;
     natid com_owner;
     /* end of part matching struct empobj */
     i_type com_type;
diff --git a/include/empobj.h b/include/empobj.h
index 57c517eb..0fbeb0f7 100644
--- a/include/empobj.h
+++ b/include/empobj.h
@@ -57,6 +57,7 @@ struct empobj {
      */
     short ef_type;
     short uid;
+    time_t timestamp;
     /* end of part matching struct emptypedstr */
     natid own;		/* valid if EFF_OWNER is in table's flags */
     coord x;		/* valid if EFF_XY    is in table's flags */
diff --git a/include/file.h b/include/file.h
index f4d8453e..70ec1e1b 100644
--- a/include/file.h
+++ b/include/file.h
@@ -67,6 +67,7 @@ struct empfile {
 struct emptypedstr {
     short ef_type;
     short uid;
+    time_t timestamp;
 };
 
 /*
diff --git a/include/game.h b/include/game.h
index 5d0d897b..a553eaba 100644
--- a/include/game.h
+++ b/include/game.h
@@ -40,6 +40,7 @@ struct gamestr {
     /* initial part must match struct empobj */
     short ef_type;
     short game_uid;
+    time_t game_timestamp;
     /* end of part matching struct empobj */
     char game_upd_disable;	/* updates disabled? */
     /*
diff --git a/include/land.h b/include/land.h
index d74db621..3f815873 100644
--- a/include/land.h
+++ b/include/land.h
@@ -50,6 +50,7 @@ struct lndstr {
     /* initial part must match struct empobj */
     short ef_type;
     short lnd_uid;		/* unit id (land unit) */
+    time_t lnd_timestamp;	/* Last time this unit was touched */
     natid lnd_own;		/* owner's country num */
     coord lnd_x;		/* x location in abs coords */
     coord lnd_y;		/* y location in abs coords */
@@ -79,7 +80,6 @@ struct lndstr {
     short lnd_land;		/* pointer to transporting unit */
     unsigned char lnd_nland;
     short lnd_access;		/* Last tick mob was updated (MOB_ACCESS) */
-    time_t lnd_timestamp;	/* Last time this unit was touched */
 };
 
 struct lchrstr {
diff --git a/include/loan.h b/include/loan.h
index f2ec2c08..542af6c8 100644
--- a/include/loan.h
+++ b/include/loan.h
@@ -44,6 +44,7 @@ struct lonstr {
     /* initial part must match struct empobj */
     short ef_type;
     short l_uid;
+    time_t l_timestamp;
     /* end of part matching struct empobj */
     natid l_loner;		/* loan shark */
     natid l_lonee;		/* sucker */
diff --git a/include/lost.h b/include/lost.h
index 179c7b9d..c371f936 100644
--- a/include/lost.h
+++ b/include/lost.h
@@ -41,13 +41,13 @@ struct loststr {
     /* initial part must match struct empobj */
     short ef_type;
     int lost_uid;
+    time_t lost_timestamp;	/* When it was lost */
     natid lost_owner;		/* Who lost it */
     /* end of part matching struct empobj */
     short lost_type;		/* Type of thing (ship, plane, nuke, land, sector) */
     short lost_id;		/* ID of lost thing */
     coord lost_x;
     coord lost_y;
-    time_t lost_timestamp;	/* When it was lost */
 };
 
 #define getlost(n, p) ef_read(EF_LOST, (n), (p))
diff --git a/include/nat.h b/include/nat.h
index 58421b5b..b2f2bd5f 100644
--- a/include/nat.h
+++ b/include/nat.h
@@ -70,18 +70,19 @@ struct realmstr {
     /* initial part must match struct empobj */
     short ef_type;
     short r_uid;		/* realm table index */
+    time_t r_timestamp;		/* Last time this realm was touched */
     natid r_cnum;		/* country number */
     /* end of part matching struct empobj */
     unsigned short r_realm;	/* realm number */
     short r_xl, r_xh;		/* horizontal bounds */
     short r_yl, r_yh;		/* vertical bounds */
-    time_t r_timestamp;	/* Last time this realm was touched */
 };
 
 struct natstr {
     /* initial part must match struct empobj */
     short ef_type;
     short nat_uid;		/* equals nat_cnum */
+    time_t nat_timestamp;
     natid nat_cnum;		/* our country number */
     /* end of part matching struct empobj */
     enum nat_status nat_stat;
diff --git a/include/news.h b/include/news.h
index 3a2a9b4b..c7361144 100644
--- a/include/news.h
+++ b/include/news.h
@@ -48,6 +48,7 @@ struct nwsstr {
     /* initial part must match struct empobj */
     short ef_type;
     short nws_uid;
+    time_t nws_timestamp;
     /* end of part matching struct empobj */
     natid nws_ano;		/* "actor" country # */
     unsigned char nws_vrb;	/* action (verb) */
diff --git a/include/nuke.h b/include/nuke.h
index cc90de95..2f7fcdaa 100644
--- a/include/nuke.h
+++ b/include/nuke.h
@@ -44,6 +44,7 @@ struct nukstr {
     /* initial part must match struct empobj */
     short ef_type;
     short nuk_uid;
+    time_t nuk_timestamp;	/* Last time this nuke was touched */
     natid nuk_own;
     coord nuk_x, nuk_y;		/* current loc of device */
     signed char nuk_type;	/* index in nchr[] */
@@ -59,7 +60,6 @@ struct nukstr {
     short nuk_ship;		/* currently aboard ship (unused) */
     short nuk_plane;		/* currently aboard plane */
     short nuk_land;		/* currently aboard land (unused) */
-    time_t nuk_timestamp;	/* Last time this nuke was touched */
 };
 
 struct nchrstr {
diff --git a/include/plane.h b/include/plane.h
index 6356a1eb..1ead6d5b 100644
--- a/include/plane.h
+++ b/include/plane.h
@@ -47,6 +47,7 @@ struct plnstr {
     /* initial part must match struct empobj */
     short ef_type;
     short pln_uid;		/* plane unit id */
+    time_t pln_timestamp;	/* Last time this plane was touched */
     natid pln_own;		/* owning country */
     coord pln_x;		/* plane x-y */
     coord pln_y;
@@ -68,7 +69,6 @@ struct plnstr {
     signed char pln_nuketype;	/* type of nuclear armament (if any) */
     signed char pln_flags;	/* State of the plane */
     short pln_access;		/* Last tick mob was updated (MOB_ACCESS) */
-    time_t pln_timestamp;	/* Last time this plane was touched */
     float pln_theta;		/* position in orbital sine wave */
 };
 
diff --git a/include/sect.h b/include/sect.h
index 15aca8b9..5932170f 100644
--- a/include/sect.h
+++ b/include/sect.h
@@ -45,6 +45,7 @@ struct sctstr {
     /* initial part must match struct empobj */
     short ef_type;
     short sct_uid;		/* equals sctoff(sct_x, sct_y) */
+    time_t sct_timestamp;	/* Last time this sector was written to */
     natid sct_own;		/* owner's country num */
     coord sct_x;		/* x coord of sector */
     coord sct_y;		/* y coord of sector */
@@ -87,7 +88,6 @@ struct sctstr {
     unsigned char sct_road;	/* Road value of a sector */
     unsigned char sct_rail;	/* Rail value of a sector */
     unsigned char sct_defense;	/* Defensive value of a sector */
-    time_t sct_timestamp;	/* Last time this sector was written to */
 };
 
 enum d_navigation {
diff --git a/include/ship.h b/include/ship.h
index 0cfab53c..0b9ed35b 100644
--- a/include/ship.h
+++ b/include/ship.h
@@ -64,6 +64,7 @@ struct shpstr {
     /* initial part must match struct empobj */
     short ef_type;
     short shp_uid;		/* unit id (ship #) */
+    time_t shp_timestamp;	/* Last time this ship was touched. */
     natid shp_own;		/* owner's country num */
     coord shp_x;		/* x location in abs coords */
     coord shp_y;		/* y location in abs coords */
@@ -90,7 +91,6 @@ struct shpstr {
     short shp_pstage;		/* plague stage */
     short shp_ptime;		/* how many etus remain in this stage */
     short shp_access;		/* Last tick mob was updated (MOB_ACCESS) */
-    time_t shp_timestamp;	/* Last time this ship was touched. */
     unsigned char shp_mobquota;	/* mobility quota */
     char shp_path[MAXSHPPATH];
     short shp_follow;
diff --git a/include/trade.h b/include/trade.h
index 8db1e6fe..307f990b 100644
--- a/include/trade.h
+++ b/include/trade.h
@@ -44,6 +44,7 @@ struct trdstr {
     /* initial part must match struct empobj */
     short ef_type;
     short trd_uid;
+    time_t trd_timestamp;
     natid trd_owner;
     /* end of part matching struct empobj */
     short trd_type;
diff --git a/include/treaty.h b/include/treaty.h
index a8c5d258..d5efd77e 100644
--- a/include/treaty.h
+++ b/include/treaty.h
@@ -41,6 +41,7 @@ struct trtstr {
     /* initial part must match struct empobj */
     short ef_type;
     short trt_uid;
+    time_t trt_timestamp;
     /* end of part matching struct empobj */
     natid trt_cna;		/* proposer */
     natid trt_cnb;		/* acceptor */
diff --git a/src/lib/global/nsc.c b/src/lib/global/nsc.c
index 71edc220..b145ec36 100644
--- a/src/lib/global/nsc.c
+++ b/src/lib/global/nsc.c
@@ -123,6 +123,8 @@ struct castr sect_ca[] = {
     /* uid needs to be NSC_DEITY because it discloses true origin */
     {"uid", fldoff(sct_uid), NSC_SHORT, 0, NULL,
      EF_SECTOR, NSC_DEITY | NSC_EXTRA},
+    {"timestamp", fldoff(sct_timestamp), NSC_TIME, 0, NULL,
+     EF_BAD, NSC_EXTRA},
     {"owner", fldoff(sct_own), NSC_NATID, 0, NULL, EF_NATION, 0},
     {"xloc", fldoff(sct_x), NSC_XCOORD, 0, NULL, EF_BAD, NSC_CONST},
     {"yloc", fldoff(sct_y), NSC_YCOORD, 0, NULL, EF_BAD, NSC_CONST},
@@ -166,8 +168,6 @@ struct castr sect_ca[] = {
     {"road", fldoff(sct_road), NSC_UCHAR, 0, NULL, EF_BAD, 0},
     {"rail", fldoff(sct_rail), NSC_UCHAR, 0, NULL, EF_BAD, 0},
     {"dfense", fldoff(sct_defense), NSC_UCHAR, 0, NULL, EF_BAD, 0},
-    {"timestamp", fldoff(sct_timestamp), NSC_TIME, 0, NULL,
-     EF_BAD, NSC_EXTRA},
     {NULL, 0, NSC_NOTYPE, 0, NULL, EF_BAD, 0}
 #undef CURSTR
 };
@@ -199,6 +199,7 @@ struct castr dchr_ca[] = {
 
 #define NSC_GENITEM(ef_type, ef_chr)					\
     {"uid", empobjoff(uid),  NSC_SHORT, 0, NULL, ef_type, 0},		\
+    {"timestamp", empobjoff(timestamp), NSC_TIME, 0, NULL, EF_BAD, NSC_EXTRA}, \
     {"owner", empobjoff(own),  NSC_NATID, 0, NULL, EF_NATION, 0},	\
     {"xloc", empobjoff(x),  NSC_XCOORD, 0, NULL, EF_BAD, 0},		\
     {"yloc", empobjoff(y),  NSC_YCOORD, 0, NULL, EF_BAD, 0},		\
@@ -235,8 +236,6 @@ struct castr ship_ca[] = {
      EF_PLAGUE_STAGES, NSC_DEITY},
     {"ptime", fldoff(shp_ptime), NSC_SHORT, 0, NULL, EF_BAD, NSC_DEITY},
     {"access", fldoff(shp_access), NSC_SHORT, 0, NULL, EF_BAD, 0},
-    {"timestamp", fldoff(shp_timestamp), NSC_TIME, 0, NULL,
-     EF_BAD, NSC_EXTRA},
     {"mquota", fldoff(shp_mobquota), NSC_UCHAR, 0, NULL, EF_BAD, 0},
     {"path", fldoff(shp_path), NSC_STRINGY, MAXSHPPATH, NULL, EF_BAD, 0},
     {"follow", fldoff(shp_follow), NSC_SHORT, 0, NULL, EF_BAD, 0},
@@ -300,8 +299,6 @@ struct castr plane_ca[] = {
     {"flags", fldoff(pln_flags), NSC_CHAR, 0, NULL,
      EF_PLANE_FLAGS, NSC_BITS},
     {"access", fldoff(pln_access), NSC_SHORT, 0, NULL, EF_BAD, 0},
-    {"timestamp", fldoff(pln_timestamp), NSC_TIME, 0, NULL,
-     EF_BAD, NSC_EXTRA},
     {"theta", fldoff(pln_theta), NSC_FLOAT, 0, NULL, EF_BAD, 0},
     {"att", 0, NSC_LONG, 0, nsc_pln_att, EF_BAD, NSC_EXTRA},
     {"def", 0, NSC_LONG, 0, nsc_pln_def, EF_BAD, NSC_EXTRA},
@@ -352,8 +349,6 @@ struct castr land_ca[] = {
     {"land", fldoff(lnd_land), NSC_SHORT, 0, NULL, EF_BAD, 0},
     {"nland", fldoff(lnd_nland), NSC_UCHAR, 0, NULL, EF_BAD, NSC_EXTRA},
     {"access", fldoff(lnd_access), NSC_SHORT, 0, NULL, EF_BAD, 0},
-    {"timestamp", fldoff(lnd_timestamp), NSC_TIME, 0, NULL,
-     EF_BAD, NSC_EXTRA},
     {"att", 0, NSC_DOUBLE, 0, nsc_lnd_att, EF_BAD, NSC_EXTRA},
     {"def", 0, NSC_DOUBLE, 0, nsc_lnd_def, EF_BAD, NSC_EXTRA},
     {"vul", 0, NSC_LONG, 0, nsc_lnd_vul, EF_BAD, NSC_EXTRA},
@@ -411,8 +406,6 @@ struct castr nuke_ca[] = {
 #define CURSTR struct nukstr
     NSC_GENITEM(EF_NUKE, EF_NUKE_CHR),
     {"plane", fldoff(nuk_plane), NSC_SHORT, 0, NULL, EF_BAD, 0},
-    {"timestamp", fldoff(nuk_timestamp), NSC_TIME, 0, NULL,
-     EF_BAD, NSC_EXTRA},
     {NULL, 0, NSC_NOTYPE, 0, NULL, EF_BAD, 0}
 #undef CURSTR
 };
@@ -484,12 +477,13 @@ struct castr news_ca[] = {
 struct castr lost_ca[] = {
 #define CURSTR struct loststr
    /* no need for uid as long as it's not referenced from other tables */
+    {"timestamp", fldoff(lost_timestamp), NSC_TIME, 0, NULL,
+     EF_BAD, 0},
     {"owner", fldoff(lost_owner), NSC_NATID, 0, NULL, EF_NATION, 0},
     {"type", fldoff(lost_type), NSC_CHAR, 0, NULL, EF_TABLE, 0},
     {"id", fldoff(lost_id), NSC_SHORT, 0, NULL, EF_BAD, 0},
     {"x", fldoff(lost_x), NSC_XCOORD, 0, NULL, EF_BAD, 0},
     {"y", fldoff(lost_y), NSC_YCOORD, 0, NULL, EF_BAD, 0},
-    {"timestamp", fldoff(lost_timestamp), NSC_TIME, 0, NULL, EF_BAD, 0},
     {NULL, 0, NSC_NOTYPE, 0, NULL, EF_BAD, 0}
 #undef CURSTR
 };
@@ -595,14 +589,14 @@ struct castr nat_ca[sizeof(cou_ca) / sizeof(*cou_ca)];
 struct castr realm_ca[] = {
 #define CURSTR struct realmstr
     /* uid is encoded in cnum, realm */
+    {"timestamp", fldoff(r_timestamp), NSC_TIME, 0, NULL,
+     EF_BAD, NSC_EXTRA},
     {"cnum", fldoff(r_cnum), NSC_NATID, 0, NULL, EF_NATION, NSC_CONST},
     {"realm", fldoff(r_realm), NSC_USHORT, 0, NULL, EF_BAD, NSC_CONST},
     {"xl", fldoff(r_xl), NSC_SHORT, 0, NULL, EF_BAD, 0},
     {"xh", fldoff(r_xh), NSC_SHORT, 0, NULL, EF_BAD, 0},
     {"yl", fldoff(r_yl), NSC_SHORT, 0, NULL, EF_BAD, 0},
     {"yh", fldoff(r_yh), NSC_SHORT, 0, NULL, EF_BAD, 0},
-    {"timestamp", fldoff(r_timestamp), NSC_TIME, 0, NULL,
-     EF_BAD, NSC_EXTRA},
     {NULL, 0, NSC_NOTYPE, 0, NULL, EF_BAD, 0}
 #undef CURSTR
 };