Where Can I find more information on when it was made and how much my Zabala side by side is worth it is a 20 gauge zabala hnos src eibar made in Spain?

To find more information about your Zabala side-by-side shotgun, you can start by checking online gun auction sites and antique firearm forums, as they often provide insights into value and manufacturing dates. Additionally, you might want to consult a reputable firearms appraiser or a local gunsmith who specializes in vintage firearms. The Zabala Hnos. brand is well-documented, so reference books on Spanish firearms or specific Zabala models may also offer valuable information.