Original side wall markings will depend on the year it was FTR'd and who did the conversion. Fazakerly conversions kept the original side wall markings until around 1954 when they started to scrub them. As you can see you can find them both ways. Butt socket s/n's should be original to the rifle. (Only the 0L girl is mine, the 1L's belong to other lucky collectors)
They are a rare example and if it is still matching (bolt, mag, forend) they I would grab her.