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 5910-01-380-3736
NSN 6130-01-496-1011
NSN 6610-01-448-8904
NSN 5950-00-509-9072
NSN 5925-01-634-0664
NSN 5910-00-473-2576
NSN 5925-01-512-8731
NSN 6685-01-265-0634
NSN 4140-01-266-1696
NSN 5915-01-659-5345
NSN 6110-01-269-4159
NSN 6135-01-275-1363