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GPO. PROGRAM B-55-S at bottom of reverse side. Yellow paper.
Oct 1980 (02)
1438
3849-A
Delivery Notice or Receipt
*GPO 1980 O-333-716 at bottom of reverse side Pink-orange paper.
Oct 1980 (01)
1439
3849-D
Notice to Sender of Undelivered C.O.D. Mail
"THREE CENTS POSTAGE is required ..." starting last line on reverse side. This example used in 1939.
c1935
1440
4245
Carrir's Statement
Two typesetting variants, believed from the mid 1950s: This one simple, smaller font. Title text is 2.5 mm x 37 mm. Last two lines of itemized statement have "Due" in mixed case. Cut to reverse flap slightly different.