I would try one of the trusted dealers' extensive web catalogs ... www.watcheden.net comes to mind. If they do not have it, then it is not being duplicated currently.
Go there, and at their search engine (top of the page) select WATCHES and SeaMaster as the search term. For me it returned 25 pages of Seamaster watches.
Keep in mind that WatchEden has a broad spectrum of replicas from inexpensive quartz models to 1:1 swiss powered replicas .. you get what you pay for. If you drop $80 on a watch, do not expect it to be 1:1 perfect.
For instance, this piece has mineral crystal and an inexpensive a21j movement ... but it's only $118