Rejected design's [sic] for the postage envelope. [Caricatures of the Mulready envelope.]
Southgate, J. W.
Mulready, William,R.A.
London : Published by J.W. Southgate Library, 164, Strand,
1840.
These show various comical scenes more or less related to mail-delivery including shipwrecks, executions, fairs, the Pope enthroned as Britannia.
Several have note: Madeley del. et litho.
Evans, E.B.  The Mulready envelope and its caricatures,
Postal stationery