[springer]

UPDATED WITH ADDITIONAL SERIAL NUMBERS WITH THEIR CORRESPONDING CASE BACK DATES ON 9/10/21:

112XXX, case back dated IV 55
223XXX, case back dated I 57
306XXX, case back dated III 57 (Sub 6536)
307XXX, case back dated III 57 (6538)
349XXX, case back dated I 1958
355XXX, case back dated II 1958 (GMT 6542)
360XXX, case back dated II 1958 (Sub 5508)
381XXX, case back dated II 1958
381XXX, case back dated I 1958 (Sub 5510)
397XXX, case back dated III 1958 (GMT 6542)
398XXX, case back dated II 1958 (GMT 6542)

398XXX, case back dated III 1958(GMT)6542)
399XXX, case back dated I 59 (SUB 6536)
400XXX, case back dated III 1958 (SUB 5508)
427XXX, case back dated IV 1958 (GMT 6542)
488XXX, case back dated III 1958(Sub 5508)
489XXX, case back dated III 59
490XXX, case back dated III 59
503XXX, case back dated I 60 (GMT)
547XXX, case back dated II 60
577XXX, case back dated II 60
596XXX, case back dated IV 60
624XXX, case back dated IV 60 (Gilt GMT)
661XXX, case back dated I 61 (Sub 5512 4-liner)
6959XX, case back dated II 61 (GMT 1675)
745XXX, case back dated II 62
87XXXX, case back dated IV 62 (Sub 5512)
87XXXX, case back dated I 63
876XXX, case back dated I 63 (GMT 1675)
87XXXX, case back dated IV 63 (Gilt GMT)
989XXX, case back dated III 63 (Sub 5513)
990XXX, case back dated III 63
997XXX, case back dated III 63
10XXXXX, case back dates III 64
10XXXXX, case back dated III 63 (Sub 5513 w/5512 case back)
10XXXXX, case back dated IV 63
104XXXX, case back dated IV 63
112XXXX, case back dated IV 64
11XXXXX, case back dated IV 64 (Gilt GMT 1675)
116XXXX, case back dated I 65
120XXXX, case back dated I 65 5513 Submariner
127XXXX, case back dated IV 64
1299XXX, case back dated II 65 (GMT 1675)
13XXXXX, case back dated IV 65
13XXXXX, case back dated II 65 (gilt GMT)
133XXXX, case back dated I 66
134XXXX, case back dated III 66
137XXXX, case back dated I 66
140XXXX, case back dated II 66 (gilt GMT)
14XXXXX, case back dated II 66
142XXXX, case back dated IV 65 (Gilt GMT sold 9/67)
15XXXXX, case back dated III 66 (Sub 5513)
153XXXX, case back dated II 66 (GMT 1675 gilt)
15XXXXX, case back dated VI 66 (model 1016, 6th qtr)
15XXXXX, case back dated VI 66 (model 6466, 6th qtr)
16XXXXX, case back dated II 67 (GMT, Mark I dial)
160XXXX, case back dated II 67
163XXXX, case back dated II 67 (one owner GMT full set)
164XXXX, case back dated II 67
168XXXX, case back dated II 67
170XXXX, case back dated II 67
17XXXXX, case back dated II 67
17XXXXX, case back dated IV 67
171XXXX, case back dated IV 67
177XXXX, case back dated IV 67 (Sub 5513)
179XXXX, case back dated II 67 (GMT 1675)
180XXXX, case back dated I 68
18XXXXX, case back dated I 68 (GMT 1675)
182XXXX, case back dated II 67
182XXXX, case back dated IV 67
18XXXXX, case back dated IV 67
18XXXXX, case back dated IV 67
183XXXX, case back dated I 68
185XXXX, case back dated IV 67
1852XXX, case back dated I 68
188XXXX, case back dated I 68
18XXXXX, case back dated I 68
18XXXXX, case back dated III 68
19XXXXX, case back dated III 68
19XXXXX, case back dated III 68 (GMT)
1902XXX, case back dated III 69
194XXXX, case back dated III 68
19XXXXX, case back dated IV 68
19XXXXX, case back dated IV 68
194XXXX, case back dated IV 68
204XXXX, case back dated IV 68 (sold 3/70)
2043XXX, case back dated III 68 (GMT 1675)
206XXXX, case back dated IV 68
209XXXX, case back dated IV 67
211XXXX, case back dated IV 68 (GMT, sold 8/13/71)
213XXXX, case back dated IV 68
21XXXXX, case back dated II 69
218XXXX, case back dated I 69
21XXXXX, case back dated I 69 (Submariner 1680)
22XXXXX, case back dated II 69
231XXXX, case back dated I 71
231XXXX, case back dated III 69
23348XX, case back dated IV 68 (GMT 1675)
23346XX, case back dated II 71 (GMT 1675)
2355XXX, case back dated III 69 (red Sub 1680)
23XXXXX, case back dated IV 70
24XXXXX, case back dated IV 69
24XXXXX, case back dated IV 69
24XXXXX, case back dated II 70
241XXXX, case back dated III 69 (red Sub)
241XXXX, case back dated I 70 (red Sub sold 7/71)
24XXXXX, case back dated I 70
242XXXX, case back dated II 70 (GMT Mark I dial)
244XXXX, case back dated II 70
247XXXX, case back dated II 70
25XXXXX, case back dated I 70
2556XXX, case back dated II 70
250XXXX, case back dated I 70
26XXXXX, case back dated III 70
267XXXX, case back dated I 70
27XXXXX, case back dated I 70 (Sub 1680, sold 8/26/72)
271XXXX, case back dated I 70
276XXXX, case back dated III 70 (GMT 1675)
2817XXX, case back dated I 70 (GMT 1675)
272XXXX, case back dated II 71 (Datejust 1603)
27XXXXX, case back dated II 71 (GMT)
281XXXX, case back dated II 71
28XXXXX, case back dated III 71 (1600 Datejust)
28XXXXX, case back dated IV 70 (red Sub sold 6/1974)
284XXXX, case back dated II 71 GMT 1675
286XXXX, case back dated II 70 (SS/14k GMT 1675)
28XXXXX, case back dated IV 70
2906XXX, case back dated II 71 GMT Mark II dial
29XXXXX, case back dated III 70 (Sub 5513)
292XXXX, case back dated IV 70 (Sub 1680)
29XXXXX, case back dated I 71
292XXXX, case back dated II 71
2961XXX, case back dated II 71 (GMT 1675/set)
297XXXX, case back dated II 71
29XXXXX, case back dated I 72 (Explorer)
304XXXX, case back dated II 72
307XXXX, case back dated III 71
30XXXXX, case back dated III 71
309XXXX, case back dated I 72
31XXXXX, case back dated II 71
315XXXX, case back dated II 71 (GMT 1675)
323XXXX, case back dated I 72
32XXXXX, case back dated II 72
3245XXX, case back dated II 72 (GMT/1675-SS)
3266XXX, case back dated II 72 (GMT Mark II)
330XXXX, case back dated IV 72 (Sub 1680)
33XXXXX, case back dated II 72
33XXXXX, case back dated III 72
33XXXXX, case back dated IV 72
3382XXX, case back dated II 72 (GMT)
34XXXXX, case back dated II 72 (GMT 1675)
35XXXXX, case back dated I 72
36XXXXX, no case back date
374XXXX, no case back date
380XXXX, no case back date
386XXXX, case back dated I 72
6167XXX, --------------- (1980 Sub 1680, VE clasp code)