Bren serial numbers.

[Brit plumber]

The centre section should have a date, I think you said it had 1940 on it, can you tell me which side thats on, also does it have a crown Enfield logo or Just the ED logo. The only other way is to check the machining, or should I say lack of machining as there were 5 variations (4 diffrent variations (1 varient has 2 sub varients)) in 1940.

Information

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[MG Collector]

They both have the ED, MKI and 1940 on the right side above the charging handle. I'm not real familiar with the machining differences, but I know both have ovular lightening dimples towards the front of the receiver.