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 6320-01-643-0850
NSN 5999-00-721-4116
NSN 5925-00-984-4556
NSN 6240-01-480-8996
NSN 5960-01-085-4231
NSN 5999-00-825-9657
NSN 7035-00-513-9764
NSN 5950-00-303-8163
NSN 6135-00-097-8162
NSN 6650-00-221-7119
NSN 5905-01-406-3423
NSN 6620-01-206-3922