Markings on Martini Henry MkIV.

Here is an 1887 MH MkIV I picked up some time ago from Atlanta Cutlery. Was wondering if anyone could shed some light on a couple of markings on the the buttstock and foregrip of this rifle. On the buttstock is '21P', and below that is the number 1166. 21 Punjabis? Second marking in question is on the underside of the forestock. I have absolutely no clue what it is, maybe someone out there has a similar marking on theirs?

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---------- Post added at 01:53 AM ---------- Previous post was at 01:51 AM ----------

Actually, now that I see it up close, it looks like the mark under the forestock is '139'...

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With my limited knowledge I see rebuild marks for Allahabad in November 1908.

Thanks DoubleD..