double gun number 18367 for sale in the united states
a 0,70" marked gun probably changed for 16 ga paper shells and center fire primer

never see a bird on the underlever before, allmost ever a dog or sometimes a fox

http://milpas.cc/rifles/ZFiles/Odd%20Fel...%20Shotgun.html

also there a high grade combination gun, the chamber probably fix again
the inlay must be in gold and silver( the black lines)and fantastic damascus steel
caliber is given as "16 ga" so a 0,70" or a 0,74"
number 16012

http://milpas.cc/rifles/ZFiles/Shotguns/...%20Shotgun.html