Welcome to the board!!!! And nice double!!!
The stamps are identified as follows,
F1 means 1960
Knight/shield with a 'X' inside: Eibar proof house mark used since July 9th 1931.
crossed barrels with a '2' is final black powder proof? One shot per barrel @ 8818 psi., for single and double barrel breechloading shotguns. This proof mark is stamped on both barrels and chamber along with the gauge in millimeters, length of chamber and weight of barrels. This one doesn't make sense!!! Maybe someone else will come in on this mark.
All the best
