doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Spanish Paper found in old gun case

can anyone tell me exactly what this paper is referring to? It was found in an old oak/leather gun case. Photos shown are front and back.

It’s a proof certificate from the Spanish proof house in Eibar. Looks to be for a 20 gauge, 70cm chambers, it was dated 1964. The serial number of the gun was 192558. It passed standard proof for 2 3/4” chambers. The barrels are (were, sometimes bad things happen) 71.2cm long, just a bit longer than 28”. It was a SXS double, measurements are indicated for both of them.

Best,
Ted

I don't know when the Proof House started issuing the certificates; possibly when the Belgian Proof House did in 1924

In addition to Ted's information, the bores are 15.9 mm = .626"
Right choke 15.6 mm = .614"
Left 15.2 mm = .598"
It was proved at 900 Kg/cm2 (most 20s were proved at 1000) which would be for a max. service load of 10,500 psi

They changed the certificate in the 70s under CIP
The chokes are indicated by * (Full) and *** (Mod)



And again in the 80s. A 12g with 3" chambers proved at 1000 Kg/cm2

Thank you, Ted and Drew. Really good and helpful answers. The gun matching the Certificate was not with the case.

I guess the Certificate in question was for an AYA. Who has that gun, you need the Certificate .