Finn capture M91 with mysterious "P"

[m40_stahlhelm]

Just got interesting Westinghouse M91 Mosin. Looks like a typical Finnish capture having [SA] markings on the left side and a Finnish Civil Guard number on the right side of the chamber
The bolt has no serial number and is a mix of Westinghouse (characteristic E) and Izhevsk parts. The magazine is from Westinghouse but follower assembly - Izhevsk. Wooden stock - Westinghouse, but the metal bottom of the stock has an early Izhevsk arrow.

The most interesting is the P mark on the left side of the chamber. I've never seen this type of P mark on the Finnish capture M91 Mosin. I only know that the P symbol was sometimes used by Izhevsk factory to sign Mosins refurbished in the 20's/30's.

Thus my theory is: this Mosin was used by Imperial/Bolshevik Russians. Next, it was refurbished in Izhevsk factory. Subsequently, it was captured by Finns during the Soviet-Finn war.

Above is only my theory and the discussion is open . The chamber is standard 7,62x54R, not Finn's 7,62x53R, so the P mark is not connected with any chamber modification.

Have you ever seen this type of P mark on any Finn capture M91? Do you know what does it mean?

Regards

[tjtM38]

I am not an expert on Finn Mosin Nagants, but I would like to see the rest of the rifle.

[Insignificant Git]

New England Westinghouse WWI contract inspection mark?

According to Terence Lapin's book, page 226 seven symbols E F H K P R S are believed to be inspection marks, although all of the illustrations in his book have an arrow mark pointing outward conjoined to the center left of the symbols