Nicknamed the "SymbolMaster", this keyboard was the first IBM Enhanced layout keyboard that came into my possession. It came in working condition but had a pretty battered case, which after some tactful magic eraser work was recovered into decent condition. I decided to add Unicomp's APL keycap set to it to compliment the overall symbols focus of the keyboard (ie, the ASCII characters on the numpad). Other keycaps added include red Esc, red Ctrls and blue Alts from Unicomp, and some PC keycaps recovered from various sources to replace the originally terminal-centric ones on the nav cluster and surrounding the numpad. The extra key granted from the split numpad plus key arrangement outputs a comma to match the keycap's legends (which I kept from the terminal layout since it matches with the symbols aesthetic).
The Model M terminal keyboards were the first introduction of the standard Model M design. Used on various IBM terminals such as the 3151, 3161, 3192, and various InfoWindow display stations, these keyboards heavily resemble PC-compatible IBM Enhanced Keyboards but commonly lack any lock-lights, featured 240-degree pin arranged DIN or modular 8P5C connectors, and have an extra key (102 vs 101 for ANSI, 103 vs 102 for ISO) by splitting the usual numeric keypad + key into two 1-unit keys. Unicomp is still able to produce keyboards to a similar spec.