If it has a s/n, it will be on the inside of the case back. Date code will also likely be there as well. If not, the movement should bear a date code. Set-O-Matic appears to be a feature, with the watch model just being a number like this one. 1978 is a good guess, image below is from 1977 - 1979 Linebook213
Bulova Set - O - Matic Model #11680
In reply to What do the internal numbers… by Winger
In reply to Hard to say without seeing… by neetstuf-4-u
In reply to Hard to say without seeing… by neetstuf-4-u
Cool. Movement appears to be dated "N8" for 1978. We don't have a lot of detailed info on late 70's watches in Hong Kong produced cases and many had no s/n or case date code, so they have to be dated by movement date.. I would guess that "R-302" is case style number. Thanks for adding the interior photos.
confirmed -
1978 Bulova Set - O - Matic Model #11680