There are no restrictions as to the 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 5975-00-276-7559
NSN 5998-01-048-7801
NSN 5960-01-139-0293
NSN 5910-01-474-5479
NSN 5835-01-606-3086
NSN 6110-01-381-6507
NSN 5975-01-502-9662
NSN 6105-00-112-7548
NSN 4140-01-190-3280
NSN 5960-00-275-7497
NSN 5895-00-501-8174
NSN 5975-01-344-0546