My OMP has

FCC I.D BCGH1000

Model Number H1000

and copyright of 1993

Mine was officially an Apple Service part and not retail, it came with NOS 1.11

I do not know about the 100 but on my OMP it just says "MessagePad" on the bottom of the front.

Is any of that different on yours? I don't even know how different the 100 is.