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At 10:08 PM 6/20/2018, Dave Casey wrote:

I don't recall it having a lamp; I thought it just has a mechanism on the
button that exposes a bright green/yellow disc when the button is depressed.

That is a Schadow switch (the line is now owned by ITT), often seen incorrectly spelt as "Shadow" switch.

Dale H. Cook, Radio Contract Engineer, Roanoke/Lynchburg, VA