That's the Cherry variant of Chicony's KB-5181. There were about 4..5 or so (2 different ALPS, Futaba, Cherry blue, Monterey), approximately one switch type per year. The ones with Montereys were made last and for the longest time, so those are the most common.
I think the earlier ones have dye sub lettering, late ones come with "decals" (coated printing).
The 102-key version was called KB-5182, I have one with Futabas. Closely related boards with different cases include KB-516x and KB-520x.