From other inquiries I surmise the actions were imported and rifles assembled by a gunsmith in Houston in the late 60's to early 70's. Apparently the smith has a good reputation, hence the high offer. I do not know who the smith was. He is likely no longer walking amongst us.
Santa Barbara is/was a well respected name/city in Spain. Santa Barbara is to Spanish guns what Toledo is to Spanish blades. I do not know if these were Spanish made Mauser actions, but that would be a pretty good presumption.