UPDATE: As I wrote below, I didn't know the history of this bike, but I asked around, because if it was an ex-Dick Mann bike, I wanted it myself. Ossa experts in the States say it has a stock frame, not a Champion frame that a pukka period Ossa short tracker would have. It might still make a good DTRA vintage race bike, but it's not a framer. This Ossa belongs to a friend of a friend, but we don't know the history of the bike, so anything below is purely the seller's claims.
Thanks to Kev H for bringing this one to our attention. The owner describes it as '1975 OSSA ST-1 250 2-stroke custom built flat tracker based on the 1977 Scott Loomis ST-1' Looks good. Not sure about the angle of the kickstart. It's on 18s, so it's raceable, but would need 19s for the best tyres. John Harrison would be happy if the new owner raced on these tyres though (read why here). Up for a buy it now at £3395 with best offers welcomed. Has an MoT too, says the owner. Fi