UPDATE: SOLD Now then, I do know this bike. The description, taken from eBay, tallies with my own thoughts on the bike, when it comes to...

Another eBay bike brought to our attention by Kev H. Looks rough but has potential and could race in the DTRA Thunderbike class and other...

It says Trackmaster style frame in the description, but I don't recognise it and it looks to have a very raked out front end for a flat...

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...