Yep, Dad bought me a TM75, which I raced in the Juniors Class in Christchurch, NZ. That would have been in 1975. There was only 1 TM/TS 90 that raced locally in Christchurch, South Island. I wonder if this is the one. (possibly Mark Selby or one of the Selby brothers can comment??)
If the bike came from Christchurch, then it mAY have came from Tommy's Suzuki, either in Manchester Street, or Moorhouse Ave. Tommy's sponsered me the following year or so on a YZ 80 (yellow metal tank, I think B model).
The 90 is a fantastic score TMBill, Congratulations.