Markings on 1919 BSA SMLE

[Jack Flat Cap]

The nosecap doesn't appear to be renumbered and the stock has no markings to indicate if it was a replacement or not, but I also cannot find a factory thorough repair mark of any form anywhere on the rifle. I attached some more pictures of different markings and the nosecap.

EDIT: I forgot to mention that the barrel, receiver, and nosecap all have the same serial and have not been renumbered.

Attachment 100338
It doesn't appear to be renumbered and there are no other markings I can find.
Attachment 100339
This is the magazine, it appears the main serial number was thoroughly stamped by the factory all over but the absence of any FTR markings perplexes me.
Attachment 100340
Here is the right-side butt socket, notice that very strange 9 that seems to be deeply stamped (possibly over another number?)
Attachment 100341
The underside of the receiver and barrel have markings of all kinds, mostly inspector's. Not sure what the 50, the W, and the 3 (under the flash) are though.
Attachment 100342
She was clearly rebarreled in 1919, but why would that be if it was made in 1919?
Attachment 100343
Another mystery mark I forgot to post, this is located on the bottom side of the stock just behind the wrist. There are no other markings on the butt-stock, not even a unit medallion.

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