Important-agency name and code number must appear as part of the indicia in the upper right corner below postage paid statement; this may not be handwritten, typewritten, or rubber stamped; only a machine printing process is acceptable by the u.S. Postal service; there are no restrictions as to method of application of the return address; only the requirement that a complete government agency return address be placed above the words official business and penalty statement
An envelope, usually made of a paper product. The face may be plain or preprinted with or without an open or glassine address window. The closure may be a gummed flap or a button and string fastener. When required a smaller envelope may be glued on the right face of the larger envelope. The interior may have a printed opaquing design and/or contain chipboard insert(s). It is designed for mailing correspondence/letters; records, or exposed and developed radiographic film. Excludes envelope, photographic negative; envelope, radiographic film mount, dental; and envelope, transparent.
Classification: Envelopes of paper or paperboard, of a kind used in correspondence
NSN 6650-00-227-8743
NSN 5910-01-633-9963
NSN 5835-01-163-4215
NSN 6145-01-007-0878
NSN 5975-00-968-7650
NSN 5985-01-358-4809
NSN 5985-01-639-8150
NSN 6220-01-147-5320
NSN 5935-00-191-0100
NSN 5895-01-147-5688
NSN 6650-01-420-7388
NSN 6105-00-012-2392