[saboteur]

I was given an Eig-Eibar 12mm black powder pistol. From what I understand it is a cheap, 1960s-ish black powder pistol. Is anyone familiar with this gun?

Also, it's missing a hammer screw and I was hoping someone might know where I could find a replacement.

[Afy]

Did a few searches, but only came up with what I assume are your posts.
My advise would be to take it down to your neighbourhood gun shop and see what they might have to say.

[arcticap]

You can try to match up the screw at a gunshop or hardware store, and use a washer to help make up for a smaller screw head.
Or if you can determine the thread spec.'s or need more help, try http://www.dixiegun.com/

Where was the gun made, Spain?

[saboteur]

Yes, it was made in Spain.