Great Britain 1840 1d Mulready Envelope (U1), Forme 1, Stereo A134
Backdated November 21, 1840, addressed to Ecclefechan, Scotland, near Dumfries. Featuring a red Maltese Cross cancel on the front and a clear red circular London dispatch datestamp on the reverse—an attractive combination from the first usage period, underscoring the early postal handling. Reverse also bears a red wax seal.

(A rarer stamp for this destination.)

SG ME2; catalogued at about £550 (~USD 710); estimated auction value USD 400–600