There are no restrictions as to the 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 5945-01-466-0376
NSN 6645-00-230-4396
NSN 5920-01-118-9492
NSN 5935-01-358-3675
NSN 5990-01-493-4039
NSN 6610-01-501-2024
NSN 5910-01-119-1434
NSN 6650-01-158-5099
NSN 5998-00-882-8838
NSN 5945-01-515-4334
NSN 6145-01-475-8483
NSN 5990-00-759-1450