Does anyone have any information on a Zabala Hnds S R C Eibar s x s 20 ga. shotgun?

Importers' names were seldom marked on guns before it was required by the 1968 Gun Control Act, so I'd say it is no more than 35 years old. I believe 10.3 mm would be full and 10.7 mm modified choke measurements for a .410. I doubt if this is anything better than a field grade or utility shotgun, so if it is fully functional and retains 90% of the original finish, a .410 double should retail for close to $400 in most markets.