Great Britain 1840 1d Mulready envelope (Forme 4, Stereo A 174), SGME2.
A very fine and fresh used example sent from Doncaster to Manchester neatly cancelled by an red Maltese Cross with a black Doncaster dispatch circular date stamp alongside for "MY.21.1840".
A couple of minor peripheral faults as most often seen. Nevertheless an attractive "May date" usage.
SG Catalogue Value: From £1,200.