stamp

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stamp:

see postage stamppostage stamp,
government stamp affixed to mail to indicate payment of postage. The term includes stamps printed or embossed on postcards and envelopes as well as the adhesive labels.
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; sealseal,
stamp made from a die or matrix of metal, a gem, or other hard substance that yields an impression on wax or other soft substance. The use of seals is very ancient, examples of great antiquity occurring in China, Egypt, Greece, Rome, and other places.
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stamp

1. 
b. a mark applied to postage stamps for cancellation purposes
2. a similar piece of gummed paper used for commercial or trading purposes
3. a piece of gummed paper or other mark applied to official documents to indicate payment of a fee, validity, ownership, etc.
4. Brit informal a national insurance contribution, formerly recorded by means of a stamp on an official card
5. an instrument or machine for crushing or pounding ores, etc., or the pestle in such a device
References in periodicals archive ?
5) If there is a desire to change the registration of the certificate, it must be indicated on the Special Issuance Instructions box of the Letter of Transmittal and a Medallion Signature Guarantee Stamp is required for all registered owners and the stamp must be on the certificate and the Letter of Transmittal and the new social security number of EIN.
For the Agreement of Assignment and Transfer, both a medallion signature guarantee and the original document are necessary.
The limited partner's signature is all that is needed; no medallion signature guarantee is necessary on the Consent Form.