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 5910-01-060-3142
NSN 5905-00-075-2621
NSN 5950-00-197-7705
NSN 6145-00-902-1410
NSN 6105-00-541-8472
NSN 6620-00-209-0767
NSN 6145-01-069-5286
NSN 5935-01-383-7164
NSN 5915-00-063-3689
NSN 6130-01-134-8213
NSN 5960-01-641-5493
NSN 4140-01-289-4811