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 2925-00-957-7329
NSN 6135-01-034-5202
NSN 5920-01-593-4923
NSN 6105-01-535-7636
NSN 5975-01-473-4310
NSN 5935-01-351-2334
NSN 5965-01-440-9039
NSN 6220-00-160-9372
NSN 5855-01-630-8608
NSN 5996-01-224-7914
NSN 5945-01-340-1367
NSN 6650-01-092-0017