I have been hunting and looking for documentation to better document the SKCM/SKCL series of switches from Alps Electric Co.
I know that other companies have used Alps switches before and Roland is one good example. One example from Roland is the MC-500 Mk II with SKCMAF(Tactile Cream Undamped).
I found another model of Roland synth that contained a switch which was undocumented, SKCMAE. This was interesting as the Roland synth was introduced in 1985 and continued to 1986. I purchased the Roland SBX-10 synth in hopes that community would be able to gain additional context to the history of the Alps SKCM/SKCL switch series. Alps SKCMAE is known by the community as Alps SKCM Brown. Below is the manual for the synth showing the SKCM name and images supporting said information.
Source:https://seriescircuits.com/wp-content/uploads/2023/12/Roland-SBX-10-Service-Manual.pdf