See: http://www.seiko7a.com/ - another parallel interest website, to which I intend to contribute.
and: http://seiko7a.awardspace.info/index.htm (site only viewable in IE - not Chrome or Firefox).
Until either of the above websites come to fruition, for information on 7A38s, see forum section:
https://www.seiko7a38.com/apps/forums/show/6635367-7a38-xxxx-model-specific-area
Or alternatively ....
go to Forum Home: https://www.seiko7a38.com/apps/forums/ and search on the model number.
Seiko 7A07 Seiko 7A28 Seiko 7A34 Seiko 7A36 Seiko 7A38 Seiko 7A48 Seiko 7A54 Seiko 7A07 Seiko 7A28 Seiko 7A34 Seiko 7A36 Seiko 7A38 Seiko 7A48 Seiko 7A54 Seiko 7A38 Seiko 7A38 Seiko
7A38 Seiko 7A38 Seiko 7A38 Seiko 7A38 Seiko 7A38 Seiko 7A38 Seiko 7A38 Seiko 7A38 Seiko 7A38-6000 7A38-6010 7A38-6020 7A38-6030 7A38-6040 7A38-6050 7A38-6060 7A38-6070 7A38-6080 7A38-6090 7A38-7000 7A38-7010 7A38-701A 7A38-701B 7A38-7020 7A38-7029 7A38-702A 7A38-702H 7A38-7030 7A38-7040 7A38-704A 7A38-704B 7A38-704C 7A38-7050 7A38-705A 7A38-7060 7A38-7069 7A38-706A 7A38-706B 7A38-7070 7A38-7080 7A38-7085 7A38-7090 7A38-7100 7A38-7110 7A38-7120 7A38-7130 7A38-713A 7A38-7140 7A38-714A 7A38-7180 7A38-7190 7A38-7240 7A38-724A 7A38-7250 7A38-725A 7A38-7260 7A38-726A 7A38-7270 7A38-727A 7A38-727B 7A38-7280 7A38-7289 7A38-728A 7A38-728B 7A38-728C 7A38-7290 7A38-7295 7A38A Seiko 7A38