So I bought my first military surplus rifle. I went with my favorite and got a Lee Enfield No 4 Mk I... Or so I thought.

Having trouble nailing down the details from it. A friend of mine, who is quite knowledgeable with military surplus stuff, is stumped.

The receiver says:

No 4 Mk I F(FTR)49

So there I believe the right was repaired in 1949. F most likely means the armory in Liverpool.

The serial number (matching both the stock and receiver) is the weird part.

JA21537A

On top of the receiver there are two worn stamps I cannot fully read. One looks like the top of the crown, but mostly worn away. The other is a "B" with a "3" underneath and surrounded by a circle.

Any help would be appreciated!
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