I bought these a while back on eBay and figured I would share this essentially undocumented variant. I had not seen standalone Micro Switch modules before and soon realized something was different about them.

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Normally Micro Switch SW series switches are secured by metal clips which are fixed in place as part of the keyboard assembly.
wiki/Micro_Switch_SW_Series
However these standalone modules include their own metal clips and pcb:
It took me a bit to find more information about these but I believe these are actually SW Series panel mount switches.
Eventually I did find a reference to the SN series Snap-in Panel Mount switch variety.

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Source:
wiki/File:Micro_Switch_SN%2BSD_series.pdf