Ted--You found a number of Spanish imports with a pre-1955 (single letter) date code? Surprises me. You're younger than I am, and there have been Spanish guns of all kinds showing up since at least the early 60's. But I can't recall looking at any with the pre-55 date code. I'm sure there are some around, but that flood of Spanish imports didn't occur until the 60's at the earliest. Maybe even a bit later.
To each his own, but if I'm looking for something to beat around, I'll look for either an Ithaca SKB Model 100, which isn't far off from Uggie 30 money especially in 12ga, or a Miroku Daly. Saw one of the latter at a recent gun show, good shape, 12ga, asking price $600. You'll look long and hard to find a Spanish 12 for the same money that I'd rate as good as a Miroku Daly. I would have snapped that one up, but I have an Ithaca SKB 150 that pretty much takes care of my needs for a not so nice 12ga.
