This gun is an old Heym blackpowder gun.

126,0 cm long (include the stock)
82,0 cm long barrel
Caliber ca. 18,0 mm

This is an very interessting gun, with special details...
:-)

It was used as an competition gun and an hunting gun for Africa.

In the moment we search for more details in old german archives, old european gun museums, pp.

PLEASE:
Who can post some ideas and details (because Im not an expert in old guns)??
Internetlinks to similar guns, pp?

Thank you and best wishes.