Pioneer knife.

[fernando]

Originally Posted by Berkley

Rabone Bros & Co, 297-299 Broad Street, Birmingham, were “foreign merchants” (exporters) of cutlery and guns to Central & South America, and a principal supplier of materials for Cuba’s railway.
As best I can tell, they did not actually manufacture the cutlery they sold...

Right you are Berkley.
I have a little turn off barrel pistol, with British proof marks and signed Rabone Brothers & Cº London on the top of the barrel, the typical place for traders (not makers) marks. It was usual for gun makers not to appose their mark on pieces as ordered by merchants and instead, engrave their trade name.