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 6620-00-646-9474
NSN 5999-01-597-2197
NSN 5930-00-482-0707
NSN 6320-01-326-1316
NSN 6110-00-715-9404
NSN 5950-01-256-6674
NSN 5996-01-023-8370
NSN 5950-01-174-7964
NSN 6110-01-109-8767
NSN 7035-01-572-5620
NSN 5905-00-925-3598
NSN 6110-00-647-3932