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 6150-01-243-6882
NSN 5975-01-103-1694
NSN 4140-01-193-1153
NSN 2925-00-238-1668
NSN 5999-00-259-7793
NSN 6145-00-657-4755
NSN 5915-01-535-6666
NSN 7035-00-834-2090
NSN 6685-01-657-6351
NSN 5998-00-063-6367
NSN 6110-00-679-8961
NSN 6135-00-080-9176