Martini Henry Mk IV Pattern B(?) Markings

[Rebel762]

I recently picked this up. The only information I have on it is that it came to Canada from somewhere in Africa back in the 1970s.

It's the additional stampings I am curious about.
1. Numeral "37" with stroke through it
2. "RAM 850"

Anyone familiar with African colonial markings can help explain these markings? Attachment 105268
Thanks

Information

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[Havenot]

The pic looks like AMR 850!

Most MkIV Martinis I've seen have been from the Nepal cache and have British and Indian arsenal roundels/markings and such on the butt-stock plus clear Nepal markings on stock and metal.

[Rebel762]

Sorry, you are correct. It is actually "AMB." Must have been tired. Will correct above.