Maker's Monogram / Inspection / Acceptance Stamp?

[Dronic69]

Evening All,

Can anyone ID the monogram(?) stamp?

They are from a WW1 torpedo pistol and apart from the serial number, the monogram is stamped on the striker assembly and on the bottom of the base
Interesting, next to each monogram is either a number "4" (base) or 4 x dots(pin assembly) ...............no other markings.

Any ideas?
Thanks
Cheers
Drew

 

[Natter]

Looked it up in "The Standard Directory of Proof Marks", but no luck. Maybe some kind of quality-control mark?