About a Thirifays shotgun

Hi, I'm Juan Cruz Bellagamba from Buenos Aires, Argentina, maybe you can help me. I posess a Belgian Thirifays in 12 gauge side by side shotgun with sidelock action. The gun is impecable, It's serial number is 1978, and it has been built after 1924 for sure, you can see that because of the particular fire proofs and marks stamped in the city of Liege, such as the choke and caliber stamps design, which are different to the ones used before 1924.
I'm interested in selling the gun, could you tell me how much this particular shotgun be worth?. I tried to attach some pictures but I couldn't do it, so I'm sending them to the address posted in the FAQs support, which is: pixhost@forthehunt.com
Of course, if you give me any other address I will send them there.
Thank you very much, and best regards from Argentina.
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JXB