Welcome to the forums from the Wiregrass, Nick! If it has black paint on it, it was likely worked on at one of the UK's arsenals in India or Pakistan. They put a stove paint on them called Suncorite. No telling what the stars are for. The P is an acceptance stamp when the military received the gun. The broad arrow is a sold out of service stamp when the gun was transferred into private hands. Take pictures with the grips off so we can see anything that may be stamped on the sides of the grip frame.

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Guy
SWHF #474 SWCA LM#2629