The special keys aren't IBM-made, though. It's just a standard Model M 1391401 retrofitted with some application-specific keys by the OEM who configured and re-sold these particular systems. (Even if
one legend they made was unusual, IBM created a new p/n for the board... They loved doing that.) So it's not quite as exciting, or valuable, as a newly discovered Model M variant.
It's kinda weird that the 5 key is all by itself surrounded by it's brothers in blue. Yep, it does not have the order key or the services key. Unfortunately this seller isn't cutting me a deal on this one and so wants to see the auction through.
Well, man, he's started it at $79.99 plus shipping, which isn't unreasonable for a standard M in as nice condition as this one. And most people who know anything about IBM boards will see this and realize it's just a retrofitted '401. So if you really want it, I'd just wait it out, and it's likely to go for that or nearly.