1939 Bren Mk.1 - just obtained & questions

[Bren1939]

Hello. A friend has just obtained a deactivated 1939 Bren Mk.I in what appears original and complete order, including cocking and dry firing.

It's stamped with "Bren Mk.1", a crown and "Enfield 1939" whilst the barrel has a few serial numbers (from A8** to X30**).

As it's a 1939 example, is there a way of tracing the serial number (B-28**) back to potentially Dunkirk, or the regiments it belonged to over its life?

Thank in advance for your advice and suggestions.

Photos below, including deactivated ammunition from June 1940:

Information

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