That one of Lances is interesting because the original spec said something similar to '.....in recognition of its change to its telescope role, the letter T will be added to and alongside the rifle designation' And there it is.
Later of course the spec was followed and the letter T was stamped 'alongside the rifle designation' on the bodyside. This was the only time that the bodysiode was stamped. The b utt socket could be re-stamped but the body-side was always engraved. In UKservice anyway!