A little info from deskthority about this specific model
looks like you get Green Alt keys and a nice numpad
heck of a deal, will go fast imo
51G8572
Effectively the same as the 1394540. The 51G8572 seems to have been produced for longer, and some later examples from 1995 onwards finally switched over to the blue IBM logo used on other Enhanced Keyboards.
1394540
The 1394540 appeared in the early 90s with the first generation of IBM RS/6000 workstations. It was generally similar to the 1391401 with two major differences - one was that the right Ctrl key was marked "Ctrl/Act", the other was the inclusion of an inbuilt speaker. Somewhat unusually, while other Enhanced Keyboards adopted a blue lettered logo in 1992, the 1394540 retained the older style black on white label throughout its production life.
