"SMK Alps mount" is possibly a hard name to parse; at the moment, we have no idea what SMK called them.
They're SMK switches that take Alps keycaps — I started referring to them as SMK Second Generation, and this comprises "Montereys" (the blue ones that take Alps keycaps), "white Montereys", the ones that take Cherry keycaps, and the ones that take SMK's custom keycap mount. None of these switches are interchangeable with any other brands. Strictly speaking, there seems to be a gap between the most-recently-seen SMK linears (last seen around 1984) and "second-generation" switches (first seen around 1986), but no other SMK switches appear to have turned up. I would be really interested to know what was sold in that gap. The US patent for "second-generation" switches was filed in 1987.
I don't class them as Alps clones for a second reason: the internal mechanism is based on their (SMK's) old linear switches (the first known SMK switches to date), where a ramp on the slider levers the movable contact away from the static contact. The lintel contact was replaced with a piece of bent wire, but the idea is the same. It's got far more in common with Cherry M7 than Alps designs.
(So far, HaaTa hasn't turned up any 1970s SMK switches ... while Cherry's switches (M6/M7) go back to the early 70s! We're also unclear on when Futaba's switches first appeared.)