I had a Greenock 42H that I was excited about bolt-modding because it had a nice light feel, and it looked really clean and nice overall.
After taking it apart and trying to make it work, I realized that it had a weird controller/connections that was/were completely different from all my other Model Ms.
PS - I tested the spacebar with acetone and it was not affected, so I suppose I got one of the good ones. If I remember correctly it dated from 1997.