I've just noticed Bazyle's reply to you above Peter – and I think this is where we would have to differ. No disrespect to him but he mentions £500-£1000 as a potential ball park figure. He may well be right and you could find someone willing to pay this amount but it certainly wouldn't be me.
As one potential benchmark – I can purchase a new Super C3 lathe complete for under £600. No need to refurbish it (well hopefully not!) and it has a motor already fitted. You do not give too many details but your lathe seems to need attention and has no motor. This is what I was referring to when I mentioned eBay encouraging "inflated" prices. Of course, if you can sell your lathe for this sort of money, then good luck to you.
For me, these old tools are only bargains if the price compares favourably to the new alternative. If it doesn't then you must either want that particular model very badly – or it has moved into the realms of being a collectable (such as ornamental lathes for instance).
I do tend to refer to my machinery as "Antique" (but with my tongue firmly in one cheek). The reality is that they started out as verging on being junk (or scrap metal). I guess we do live in a funny old world though – where there are very few "Junk" Shops left any more. They tend to all call themselves "Antique" Shops these days.

Regards,
IanT