David, I've never seen one quite like that before. But going back to the pre-WWII years in particular, the Germans were the ones that loved multiple bolts. The Spanish, for the most part, copied British actions--although AyA made some pretty decent Merkel OU clones. And I once owned a more modern AyA that was a copy of a pretty high grade Sauer boxlock--even marked "AyA-Sauer". But my guess would be, if it isn't something the Spanish came up with on their own--and they're mostly good copiers, not innovators--it probably came from a German design.
