Nice Boar. Do you live in or close to Bratislava? It looks like a Roux(Underlever) drilling. It passed thru the Zella-Mehlis proof facility in 1906 or 1908(I can't see if the last letter is a 6 or an 8). Brenneke slugs were designed for just such sporting arms.



Cheers,

Raimey
rse