Important-agency name and code number must appear as part of the indicia in the upper right corner below postage paid statement; this may not be handwritten, typewritten, or rubber stamped; only a machine printing process is acceptable by the u.S. Postal service; 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 5945-01-551-3507
NSN 6650-01-300-1668
NSN 5965-00-080-2045
NSN 5950-01-342-2147
NSN 5910-01-524-3422
NSN 5835-01-416-6449
NSN 5895-00-369-7108
NSN 5905-00-272-3476
NSN 6145-00-281-8161
NSN 5945-00-696-8318
NSN 5930-00-493-5297
NSN 2925-00-984-7525