Nice... does it have the G model tank which is a bit smaller?
The yellow US YZ250H model came standard with a 'G size' tank. It was the white Euro model that came with the larger tank! Also the first of the twin leading 'famous' Yamaha twin leading front brake plate, came on the 1980 YZ465G. The 1982 YZ250J was the first 250cc to come with it stock.
Cheers
Ando