This thread is probably in the above but I wanted to make sure it was included as it has W. Collath info as well as image components by Cordell:

http://doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=193971&page=1

Teschner-Collath did sourced the makers of Zella Sankt Blasii & Mehlis for their offerings:

http://www.littlegun.info/arme%20allemande/artisan%20c%20d/a%20collath%20w%20%20gb.htm
Probably a percussion predecessor.

Kind Regards,

Raimey
rse