What is value of Spanish made mugica pigeon grade 16 gauge sxs shotgun model 16 gauge sxs shotgun?

I have a muguca 12 gauge which I have bought from a friend for 250euros. It is still in good condition balances well and shoots very straight. I fire around 500 rounds with it every year . I am very happy to own this gun though I wish it was an ejector. It has coin finished side locks engraved. The wood is better than average. It is a pleasure to shoot with it and I always get my share of game.

Carmel from Malta