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 6130-01-193-0471
NSN 5905-01-182-6594
NSN 5925-01-415-0261
NSN 7035-01-627-7729
NSN 5996-00-235-0823
NSN 6110-01-450-9654
NSN 6610-00-081-2365
NSN 6610-01-525-8235
NSN 6650-01-475-3714
NSN 6685-01-370-2253
NSN 6130-01-371-3805
NSN 5996-01-587-7742