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 4140-01-252-8902
NSN 5950-01-153-7585
NSN 5998-01-406-9082
NSN 5996-00-111-1538
NSN 6240-00-342-9756
NSN 5855-00-763-2155
NSN 5855-01-147-4785
NSN 6105-01-183-5509
NSN 5998-01-506-4348
NSN 5985-00-401-5035
NSN 7035-01-420-5404
NSN 5835-01-492-4318