About twenty tears ago I owned an Otto Bock cape gun,5.6x54R, 20gs, and another set of barrels 20ga x 20ga and a claw mounted scope. Under lever opening. The rib was marked Otto Bock, Berlin, Maker for the Noblity. A friend now owns the gun.

I don't know if it's true, but my friend tells me that Otto
bock was involved in the business of the inventing and manufacture of artifacial limbs. Very interesting, if true.