A place for show-and-tell, wondering aloud, and wandering the trails of curiosity . . . Comments, corrrections, additional information, fresh insights, other interpretations, more images, or related observations will be welcomed!
Trade card. There are several variations of this card; these are the major two.
It is possible with these cards to observe early and late states of the plates, showing progressive wear, much as is done with engraved early postage stamps.