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 6645-01-466-0185
NSN 5925-01-248-9250
NSN 5999-01-508-0218
NSN 5950-01-367-1870
NSN 5998-01-426-8989
NSN 6645-01-393-5128
NSN 5920-00-314-5313
NSN 6220-00-959-5970
NSN 6650-01-314-8454
NSN 5910-01-056-6251
NSN 5930-00-368-8006
NSN 6610-01-395-7441