Progressive Die Essays
This three-part progressive proof, or more correctly, die essay were first reported in the Essay-Proof Journal of 1973. They were part of a Canadian bill stamp proof display by Dudley Atwood in April of 1972.
Left: the medallion. Middle: the medallion plus a partial frame (right side unfinished). Right: the medallion plus the top and side frames but minus the bottom and numerals. Those parts were cut out so that when the mock-up was superimposed over number two the complete frame would be evident.
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