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 5930-00-291-5400
NSN 5855-01-088-4353
NSN 5910-01-287-9194
NSN 5895-01-229-7431
NSN 7035-01-182-1086
NSN 5920-01-445-9617
NSN 6645-01-609-7365
NSN 2925-01-577-0004
NSN 5915-00-911-9313
NSN 5855-01-465-9791
NSN 5965-01-186-2051
NSN 6320-00-701-0437