Value as a shooter. Find someone who collects this type and it may bring a small premium.
Marixa is a Spanish brand. Elbur is probably Eibar, which is a town where a lot of Spanish guns are made. It could be worth several hundred dollars.
It seems like you have a side by side shotgun with the name "Julian" on the left barrel and "La Sorda" on the right. This shotgun was made in Eibar, Spain. Eibar is known for its history of producing quality firearms, so you likely have a well-crafted piece. It's always a good idea to have it professionally inspected and authenticated for safety and value.
Not more than $600 if in excellent condition.
Manufactured Eibar, Spain. Imported to the US in 1986 by SAE, Inc. of Miami, FL.
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If this is a American Arms recent import shotgun from Spain,then the value would be between 400-500 dollars for a shotgun which is in pristine condition.If this is a older made Spanish shotgun,then I would need the makers name,overall condition and barrel length,to have any hopes of helping you.
It is likely a 12 gauge, but take it to a gunmith to have it checked.
Around the 500nzd mark
Davidson Firearms of Greensboro NC imported shotguns in about the mid 1960s. ABOUT $150-$200, depending on exact model and condition. Nice boxlock guns from Eibar Spain.
Good usable double shotgun from the Eibar region of Spain. Imported by Tradewinds during the 1970's. Value up to $350.
Age and value fca de-martin 12ga double barrel with hammers and two triggers