I also identify it in a 1977 catalog as a model 6 (per the engraving, I mean).
You ask for a guess in the price you pay for it: how about 600 USD? I think that its value is much higher, but by the way you ask for a guess, I imagine you pick a real bargain!!
Victor Sarasqueta shotguns are genarally very well made and are much apreciated as a brand in Spain and Mexico.
Don Victor, the owner, used to say " Do it right whatever you do, because the things well done cost a little more to do, but everybody wants them" (maybe is a poor translation, but I think you can understand what he was trying to say)
Enjoy it.
