I have actually given this some thought.
I read a book about restoring a Hawker Hurricane recovered from India. During the restoration if they had to remake a part they disgreetly added their own initial and date following the style used during the original build so the part could be identified in the future.
The pintle is identical to an original so as you point out it would be hard to tell it from an original. I have contemplated marking the back face with a date stamp. You would never see it as it's bolted to the armour but would be an identifying feature for the future. I'd need to speak to the people who want them.
Ben
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