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Domestic Mail Manual P021 Stamped Stationery - USPS
Plain stamped envelopes are available at all post offices, except that: a. Only sizes 6-3/4 and 10 regular and window envelopes are sold in less than full box
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PS Form 3615 - Mailing Permit Application and Customer Profile
Complete if mailer will mail using: Precanceled stamps. Government precanceled stamped envelopes. a. Mailer precanceled postmark. b. Preprinted rate markings
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How to Order and Use Penalty Mail Stamps and Stationery
Dec 1, 2001 requisition and use penalty mail postage stamps, stamped cards, and stamped embossed envelopes as part of the penalty mail stamp (PMS)
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