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6 Key Keypad, vintage. Manufactured by Grayhill.
Here is a vintage old bell type keypad with 6 keys.
Normally open contacts, 3 pins per key. Functions like a normally open switch with an additional pole.
2.06" x 1.37" x 0.75" (depth without pins).
There is a patent # of 3,818,169 on this keypad, for the curious here is the patent in PDF format.