Embellished Spanish Double/Mandall Import

Customer brought me this really cool exposed hammer double. It was made by Fcc Crucelegui Hnos (The Hnos, being an abbreviation of "Hermanos"...Brothers), Eibar Espana and imported by Mandall's Shooting Supplies. Apparently, it's a Model 150. I can find no source of the parts I need for this.

I'd like to find out more about this shotgun, it needs new nipples, FPs and springs although I do have the nipples that came out of the gun. It's got lots of engravings on it and the receiver is color case hardened.

A neat old piece.