This was my first vintage IBM keyboard and now the flagship of my collection. In a way, the performance of this keyboard ensured I got sucked into and stayed with this hobby. So sufficed to say, this keyboard holds great sentimental value! The original terminal-centric legends were largely replaced with a Wheelwriter 6 keycap set recovered from a beyond recoverable keyboard assembly, with some standard PC Enhanced Keyboard keycaps peppered in. The pearl Esc, and pebble Fn, 1u backspace and old-style Windows logo keycaps were from Unicomp. The Ctrl/Enter keycap was from a IBM 3270 PC keyboard of some sort. I presently unsure what exact terminal this keyboard operated with. This keyboard was also featured in my Differences between and classifications of 122-key Model Ms comparison topic.