P14 ERA "EK SE ???" On receiver, what does it mean?

[RC20]

Maybe someone can answer that but we are limited to the US version as far a ref goes.

All we can say is the Brits had a completely different labeling system and even did not go with specs (as I recall they had issues with quality control not resolved before contracts were ended).

Brits had a major proof stamping system, possible it was done in the UK not the US though if you can see raw metal then a stamp has been done after the finish was put on at the factory.

Not sure if this helps, if you could post a picture?

British Firearms Proof marks - Google Search

I am not going to make this a its a fact statement, take more research, possibly a gun smith.

But, Proof Marks in general are put on when passing inspection and or tests. If they fail they are not proof marked I believe. So a lack of a Proof Mark would be illegal (though it might be ok as it slipped through a crack)

Proof marks on the other hand should indicate it passed.

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