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 6240-01-422-1878
NSN 6320-00-456-0836
NSN 5910-01-322-6984
NSN 6240-01-341-7903
NSN 5895-00-868-5188
NSN 5998-01-481-3129
NSN 6135-01-326-2536
NSN 5996-01-531-8564
NSN 5925-01-529-6836
NSN 5920-01-195-2299
NSN 5905-01-245-3452
NSN 7035-00-215-3272