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 5990-01-271-8130
NSN 6220-01-466-8702
NSN 5999-01-512-3060
NSN 6105-01-623-6204
NSN 5960-00-875-9823
NSN 6240-01-377-5503
NSN 5996-00-311-9302
NSN 5999-01-170-4354
NSN 6130-01-531-3624
NSN 6650-00-318-6033
NSN 6240-01-196-0497
NSN 6145-01-146-4020