Could be Berhnard Merkel but difficult to say without seeing the marks. It is a Kerner - Anson Platform with 1/2 pipe side frame reinforcement adorned with Sauer Blade indicators with an Asian Buffalo Horn triggerguard bow. Too, the back of the frame is a bit Odd in the scalloped detail?

[Linked Image from thumbs2.imgbox.com]

Hochachtungsvoll,

Raimey
rse