Serial #57-03-296-05, 2 ¾” chambers, round action with detachable sidelocks, 28” barrel, chopper lump, flat rib, bores at .732”, constriction is .008 (imp cyl) and .017” (Mod).
Bores and chambers are nice and shiny.
Case color action with 50%bold acanthus leaves engraving. Colors at 95%+
It is tight on face with plenty of bolting reserve.
Weight is 6 Lbs 12 oz.. Balances at hinge pin.
LOP is 14 7/8” with a cut in the stock to alter pitch (???).
It would be possible to eliminate that cut by installing a 1” pad. In that case, LOP could go up to 14 ¾”.
Drop is 1 ½ & 2 3/8 , cast is ¼ off.
This gun is in excellent overall condition with the metal at 98+% and the wood at 95% with light handling marks and some deeper gouges right at the heel.

Click on the link below to see the listing on Guns International with more pictures :

https://www.gunsinternational.com/guns-for-sale-online/shotguns/arrieta-shotguns/griffin-howe-by-arrieta-ejector-12ga.cfm?gun_id=103849140&cdn_bp=1