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Welcome to Postmark Shapes!
Welcome to a forum built around the shapes and structures of postmarks. You can browse discussions on region themes, duplex cancels, scan sharpness, and album sequences, and share your own observations when ready. Guests are invited to read freely and join in wherever a topic fits.
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Cancellation Size Reference Frames
Discuss reference frames for cancellation sizes and how consistent measurement supports comparison and cataloging.
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