From 1906 commercial, going clockwise:
No mark
Lawrence (9mm L-4)
No mark
Bianchi (Luger #16)
Mitchell Arms
No mark
No mark
Audley
No mark
Colorado Saddlery Denver (1731 Luger 3-3/4)
Luger 4-1/2
Simmonds (Leetonia, Ohio)
Buffalo Brand Denver (31 15)
Washington Hardware (Tacoma, Washington 96 Luger 4)
Hunter (1100 23)
Idaho Leather Co. Boise (88 L-4)
Browning
Safari Land (79 Luger)
Bauer Bros. (HE 35)
Heiser (422 Luger 7.65)
Heiser (422)
Redhead (120SDB)
Bucheimer (371-78 Luger)
Center L-R
Stan's Gunshop (Luger 32)
Safety Speed (9mm 8 Luger)
No mark