Plug

plug cancel
Colloquial name for a round, double circle marking, officially known as a validator stamp. The plug is chiefly used on postal receipts and registered envelopes. Also called a registry cancel or round-dater. [Back to top]
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Plug: a part of the printing plate that is literally plugged into the main design; such as value, etc..
Plug cancel: round, double circle marking, officially known as a validator stamp; used on postal receipts and registered envelopes.

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Plug - Insertion on a printing plate or hand/machine stamp - figures of value, repairs etc..
Pmk. - Abbreviation for postmark.
Poached egg - Popular term for many kinds of testing label bearing a design resembling such an object.

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Topic: Philately