Dwight,
The ones I examined in my collection appear to be stamped based on some distortions in the tops/bottoms of the property numbers, particularly the O (Top and bottom) are dramatically different and less clean/deep than the sides, indicating that a more or less flat die was struck against a curved surface. It is my understanding of the pantograph process that the marking would be uniform even on a curved surface.
Of course, I may be completely ill-informed. Wouldn't be the first time.
Tom A.
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