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 5996-01-262-3005
NSN 5998-00-373-2909
NSN 5945-00-470-9447
NSN 6145-01-151-0238
NSN 5855-01-373-4610
NSN 6130-01-479-0950
NSN 5996-01-390-0536
NSN 6135-01-386-5709
NSN 5855-00-138-2386
NSN 6150-01-043-1751
NSN 5855-01-325-3380
NSN 5835-01-521-4979