When was a Spanish-made double barrel Sears Roebuck 2 3-4 chamber choke full mod engraved received date made and serial number stamped into the forearm that looks a lot like a Stevens 311 made?

What am I missing here? You want to know when it was made but you say the date made is engraved on the forearm? Looking through the store brand cross over list, the only Spanish maker of Sears shotguns I find is Laurona. Laurona was founded in 1941 and manufactured side-by-side shotguns until 1978. The Model 13 was a boxlock sold through Sears & Roebuck, and most boxlock doubles look similar.