Both the Ray Schalk and Sam Crawford you pictured are "spot on" , I did notice the dates on the Schalk and the Crawford were 1955 & 1957, Speaker died in December of 1958. So who knows ......Maybe he WAS at death's door.
I've attached an image of an early 1950's signature on a GPC that is typical of all I've seen. Except for very early Tris Speaker signatures. They have all been very consistant.
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jim@stinsonsports.com