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 5915-01-294-7866
NSN 5895-00-684-6879
NSN 6320-01-310-8068
NSN 6110-00-004-8883
NSN 6110-01-158-1247
NSN 6610-00-222-4108
NSN 5915-00-402-9040
NSN 5985-01-208-8944
NSN 6110-01-554-0544
NSN 6610-01-023-1812
NSN 6320-00-483-0451
NSN 6650-01-607-2620