Sounds like a 1980 "T" model Dan,, which may of been pre-compliance at the end of 1979.
I believe the 200 serial prefix is 1980? The good thing about this place is there is someone to always immediately correct one when they are wrong?
Out of my three PE175s I liked the power delivery of 1980 T the most> best suited for trail riding I thought.
Although the "Z" could
float faster
Mick.