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 6220-01-439-3490
NSN 6150-01-054-7409
NSN 6320-00-456-2092
NSN 6620-00-199-8734
NSN 5998-01-245-7144
NSN 6610-00-787-2674
NSN 5905-01-323-1581
NSN 5996-00-466-7857
NSN 6105-00-785-8316
NSN 5960-00-942-5634
NSN 6135-01-572-3296
NSN 4140-01-067-8986