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Alps AKC
Alps AKC switches, commonly referred to as “Alps spring bridge” are a mid-1970s series of Alps switches.
Characteristics
The switch consists of a stem with a metal rod through for attaching a keycap, and a recess in which a fine, gold-plated spring rests slightly deformed. As the stem is pushed, the spring brushes against the contacts, which are tinned pads on a square chunk of pcb substrate. This pcb substrate passes through a slot on a key module's PCB and is bridged to it.
Several variations exist
Additional Information
The switch was likely in production from as early as 19733) to 19794). It was replaced by Alps SKCC Gray
The switch could sometimes be seen with a mount adapter allowing for cruciform mount keycaps to be fitted.