The more I look at it, the weirder it is. The cable is far shorter than other Model Fs. Unlike the buckling spring Model F industrials I've seen, it has feet and no drainage channels/openings near the bottom. Two theories -
A) This thing was just a different revision of the Industrial Model F that was damaged, and some third party vendor retrofitted it with their own keyboard assembly/controller.
B) IBM, for whatever reason, needed to subcontract the manufacturing of these keyboards to a third party. It would explain why the case is completely different to IBM-made industrials, but it would seem unlikely that IBM had such a huge demand for them that they'd need to subcontract them out...
I dunno.