There is currently a 1925 Model 6 for sale on e-bay [ item no 182906829446], the 'buy it now' price is £4300 which seems too good to be true and it probably is. The advert follows the format of a recent one for a Vincent Comet which was very suspicious. Please tread carefully.
Interesting - I just checked and it has been removed!
It's back on again now with a different bid price.
I investigated a little further. It is definitely a scam - don't go near it!