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Alex W
Cant help with the T mark but the R on the barrel knox is for replacement or reserve grade barrel (as per SKENNERTON). As mentioned the HV is High Velocity sighted for Mk VII ball.
Im not 100% but Ive read that the butt discs were stopped in 1916. Your rifle is made in 1917 but also has a distinct marking where a butt disc was. Possible that the stock has been replaced, it looks a little dark but it might just be the pictures. Are there any other markings on the woodwork? Either way if you're shooting it, it wouldn't worry me, original stocks seem to split on me whenever I try to shoot with them.
Alex
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