Originally Posted by fernando
If you have James Lavin "A history of SPANISH FIREMARS", you may be interested in observing gunmaker's mark #96 (page 277) named Seria. Maybe this is your guy.
I guess that could be a "Y", It looks like a "T" to me and the style seems 17th century. These marks can really be critic. Looks like the barrel mark says CERRA. Have you seen a place name in one of these marks?
Here is the mark from the other pistol in the set.