looking for older post about the 10,75 x57 I came to buckstix Haenel Model 1900 in 10,75x68 - rechambered - from something unknown
http://forums.nitroexpress.com/newreply....mp;vc=1&q=1

and when looking on the pics it hits me like a hammer

we dont figure it out then what it was before someone stamp it with 10,75x68

but it have the same proof load like the kettner rifle here! so far any C.G.Haenel pre WW 1 rifle in 10,75x68 is now a suspect old 10,75x61 Haenel!

here another one in auction in 2008 by James D.Julia

look at Haenel advertisments but the 10,75 is not there