I am having a devil of a time telling the difference between Austria Sc 620, 621, and 622. I know that ridges on engraved stamps (620) can be detected with your fingertip or by lightly rubbing a piece of Al foil on top of the stamp. But I am at a loss for what differentiates the typograph (621) and the photograph (622) stamps.
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Posted 09/09/2017 10:16 am
