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 5990-00-140-4559
NSN 6220-00-239-4427
NSN 6685-00-916-8274
NSN 6240-00-476-1228
NSN 5935-01-568-0556
NSN 6220-00-981-9184
NSN 6620-01-461-6427
NSN 5945-01-060-3216
NSN 5835-01-350-0566
NSN 5996-01-592-3011
NSN 5975-01-158-6150
NSN 6220-01-047-4060