Need to find info.

Question
I have receive a double barrel shotgun, 10 ga., made in Spain and stamped on the barrel :Made for The American Import Co. San Francisco Calif.  Also stamped ARMAS "GIB"-Eibar-Made in Spain. Also have serial numbers found underneath the stock 13176.  Where would I need to look for info on this?  Any help would be appreciated.  Thank you!

Answer
Hi,
From the 1950s to 1980s there many shotgun made in Spain imported into the USA.
Here an overview.
http://www.chuckhawks.com/spanish_shotguns.htm
Basically a lot inexpensive side by side shotgun were made and imported.
Guns like yours can sell for $900ish if in excellent condition.
$400 to $700 is typical range.