Seiko Watch Production Date Calculator

In the last year this software has been used to successfully calculate the production dates of over 25,000 watches. Based on usage data, we have calculated the most popular movement numbers. The top 50 are listed in the table below.

Rank: Count: Movement:
1 10271 7S26
2 8273 6309
3 3996 6139
4 2954 7002
5 2391 6119
6 1789 6138
7 1622 7S36
8 1508 4006
9 1337 6106
10 1320 6R15
11 1252 7005
12 1083 7T32
13 1066 7019
14 1063 6105
15 1016 7006
16 1009 4R36
17 761 4205
18 672 5606
19 481 6117
20 424 5626
21 422 7546
22 374 8L35
23 336 6602
24 296 7C46
25 286 2205
26 274 7A38
27 268 6306
28 259 7A28
29 232 2906
30 206 7016
31 195 5740
32 172 7625
33 150 5625
34 143 6619
35 140 5126
36 124 5000
37 117 2706
38 100 8F32
39 100 6146
40 98 7017
41 93 7A48
42 93 4502
43 91 6020
44 80 5106
45 76 6118
46 76 4R15
47 75 5T52
48 67 6159
49 66 6145
50 62 5216