The info is from Adolf Zimmer's 1877 text, 2nd edition, curiosity of Axel E.

http://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=201021&page=1
Some later Berger variants.

Subject Teschner-Collath / Berger variant:




Sometimes touchmarks will be found on the rotary lockup.





Kind Regards,

Raimey
rse