Thank you, JC.

In the meantime i did a bit of research and found out that these guns were recently built in Spain for the German gun dealer Frankonia Jagd (formerly Waffen-Frankonia). In their 2000 catalog the price was 3000 DM (1500 euros, or over $2000 by current rate). A couple of users said the workmanship is good. I wonder which Spanish maker actualy made Denia doubles?

The used specimen ilustrated above was sold today in Germany for under $700.