With no references to this part number online prior to my purchase of this keyboard, I pretty much had the pleasure of introducing this Model M to the community in late June 2020. It's otherwise a pretty standard Model M with an interesting badge and contrast to previous Ambra keyboards discovered. Unique is the lock-light overlay that features small, circular cut outs for the LEDs and the lack of blue-grey case colour other Ambras have. Since that latter fact is sorely missed on this Ambra, I 'reintroduced' the blue-grey aesthetic with Unicomp grey keycaps on the alphabetic and non-operator numeric keypad keys.
The PC-compatible IBM Enhanced Keyboard was the first home consumer, most common and the definitive Model M keyboard, becoming IBM's choice keyboard for a decade after its release and still in production today as the Unicomp Classic. Labelled as being "enhanced" in regards to its layout that became an industry standard and is still used today (with the addition of GUI keys), the Model M is perhaps the most well-known keyboard of all time thanks to the success of the Enhanced Keyboard. The Enhanced Keyboard was also made available for IBM's earlier "classic" Personal Computer series in both XT and AT flavours, and several other distinct variants exist for other types of systems and custom orders from third-party companies such Ambra/ICPI, Dell, General Electric Healthcare and Sabre.