IIRC, there was a special European (English?) release of 6.0.8 for the PowerBook 100.
I wound up with an image of it something like ten years ago, the capability of running it was one of the things that convinced me to buy BabyPB in the early-mid Nineties.
edit: Yup, it was 6.0.8L and difficult to get in the States until it was basically of no practical use anymore. :
