Design Comparison Bench + Contrast Case Engine
Compare stamps
Put two stamp forms side by side, then test the category boundary against look-alike objects and postal markings.
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Mandatory signature feature
Contrast Case Engine
Choose a pair. Each case says what fits the release scope, what does not, and why the boundary matters.
Adhesive postage stamp
The issued label used to evidence postal prepayment.
Postmark / cancellation
A marking applied to mail. A postmark records origin/time; a cancellation prevents stamp reuse. The mark may cross the stamp but is not the printed stamp design.
Printed postage stamp
A small issued postal label or credential.
Handstamp device
A rubber, metal or other marking tool applies an impression. The shared word “stamp” names both a printed object and a marking device in everyday language.
Postage stamp
Evidence of postal prepayment.
Revenue / fiscal stamp
Evidence of a tax or other fee. Visual and material overlap does not erase the institutional difference.
Separate adhesive stamp
An independent label affixed to the mailpiece.
Postal stationery indicium
Prepaid postage printed or embossed directly on the envelope/card rather than supplied as a separate adhesive label.
Evidence: npm-markings