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Do the frames of both measure the same?
Measurement has nothing to do with the appearance. In this case observation is the key. The toga button in the left stamp has a sharp outline with a ring of unprinted area surrounding the vertical lines in the center. The engraved stamp on the right does not have a sharply outlined toga button with an unprinted area surrounding the vertical lines. Also, the offset stamp has a break in the left 2, making it a type V or Va depending on the configuration of dots on Washington's nose.
Clark