(US) An adhesive stamp sold by the US Federal and various state governments as proof of payment for a duck-hunting licence, with the proceeds used for conservation programs.

plural of stamp pad

A stamp mill

type of mill machine that crushes material by pounding rather than grinding, either for further processing or for extraction of metallic ores

A stamp mill.

plural of stamp hinge

(US) A postage stamp with no indicated monetary value and indefinitely valid for a given service, e.g. a domestic first-class letter under 20 grams.

A label resembling a postage stamp, but not issued for postal purposes by a government postal administration.

A postage stamp which includes a premium for charitable causes in addition to the charge for postal service.

A stamp or similar paper document (e.g. coupon) issued to be exchanged in shops or storage facilities for food, or (by extension) for other essential provisions, notably in a rationing system or as a non-financial form of welfare benefit.