BSA Long Lee (?) Trainer - designation?

[englishman_ca]

The Birmingham Nitro Proof markings on the left hand side reinforce are post 1955. There is a small date code marking of crossed flags with letters, detail pic would tell in what year the rifle was civvy proofed.

I note that there are earlier proof marks on the right hand side reinforce too. First I was thinking that one set was when it was 303 and later it was reproofed when converted to .22, but I notice that both sets are .22rf.

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