I saw this one on eBay a while back but sadly couldn't stump up the readies (I wouldn't fit on it anyway
). The frame and bottom end are definitely Minsk - which is also the flying bird logo - but the top end, forks and brakes I don't recognise. From memory, Neval's modified some of their bikes for offroad, and I rode a trials Minsk at Denver sluice garage back in the day, but I'm not convinced anyone but the factory would actually bother doing this conversion to such an unlikely machine...