The water table should have the maker's name (or mark) stamped on it as well. Yes, Sarriugarte made whole guns. (pronounced: sorry-oohhh-gart-tay - more or less)

By the way, Sears imported an AyA and sold it as their "Model 100" that allegedly is a Model 21 clone.

If the gun has pistol grip, single trigger, no sling swivels and fat beavertail forend it probably was made for export to the US.