Just picked a 12 ga SxS today. Only marks on it are the winner and imported. Tried googling but had no luck. Does anyone have any info on who made them?

Best I can come up with is it of Spanish make from the 50's or 60's. This is not an area I have much material on so assistance is limited. Actual maker may be difficult to determine as many were local shops of which many have disappeared or merged into other manufacturers. I suspect there are other markings that may be mistaken for proof marks that could be helpful.

I'll look a bit more but odds are pretty slim I'll find more. There are others on this site who are very knowledgable on SxS guns of all types and should be able to give you plenty of information.