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While you're correct about the 50's phone having a metal dial, the phone pictured is circa 1965. Sleeker phones with plastic dials were introduced in the early-mid 60s. The dial is removed by gently pressing on the center and twisting counter-clockwise.

The GSM phone pictured was a portable phone designed to be carried in a briefcase or special pack. It could be used in the car with the optional car-mount and lighter plug-in. It was a "go anywhere (within radio range) phone. You could also plug the primary base into an AC wall outlet.