Spanish shotgun models are pretty slippery, but I don't think that's a 208. Here are a couple examples of model 208s:

http://www.armeriaalberdi.com/index.php/...2-num22385.html

http://www.armas.es/foros/escopetas-para...ra-t970958.html

Your gun looks to me to be closer to a very plain model 209. Given the lack of engraving, freckling, and general sense of 'well used' I'd guesstimate value in the $500 - $600 range.