Who actually made the guns peddled by Geyger and Reeb has been a question I have wanted to see answered for quite some time; thus far I haven't seen any "tell tale" marks. The sculpturing of the fences about the cross-bolts does seem to be typical of the two merchants.

A Geyger 12ga:





A Geyger 9.3X74R:





A very nice Philip Reeb 8X57JR "muzzelverschluss" a.k.a. "clamshell":



Buchseman