HT-100 with HT-220 slimline, and rear of HT-100 with its battery
top of HT-100
inside of HT-100
HT-100 circuit board, component side, and solderside of HT-100 circuit board
Notice the lack of PA transistor and a squelch control pot that is normally on the HT220 models.
HT-100 images (from an ebay item):
HT-100 parts lists from a 1978 Motorola Parts & Data Handbook:
Click here for HT-100 Parts Lists