VIN Numbers And Year of Manufacture??????????

 Hi Guys,

Anyone know where to look up VINs for bikes earlier than 1980?

Also, how early the previous year would a bike be built then sold as
the next years model?

For example, I have a Yamaha DT250 titled as a '76, yet it was
manufactured in March of '75.

I know the new bikes come out late Summer early Fall for the next
year, so if the frame sticker says manufactured in '75, could it be a
'76 bike?

Thanks,
Tim

 
Still running that GT80?


Dave