Gamewell M46-7

Had this for a while. Anyone got any unique information on these, or how rare they are? I believe it’s from 1962 (first year of Centuries and 2nd oldest NIB device I have)

Pics of pull and manual:


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I also own one of those and yes its from 1962

What exactly makes it unique aside from the model number & what look like dual pairs of terminals?

I’m fairly sure it has a DPDT switch