The BV with the crown above is the proof house marks Birmingham from 1925, and the not British make is because it was imported into great Britton. I think it was one of the guns that was imported from the USA for use of the home guard during WW11 until suitable weapons came available.
Hope this helps
The other marks are from the manufacture maybe some from your side of the pond can explain.
Sundodger
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From where the sun Don`t shine
Steve
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