Mulready stationery describes the postal stationery lettersheets and pre-gummed envelopes that were introduced as part of the British Post Office postal reforms of 1840. They went on sale on 1 May, 1840, and were valid for use from 6 May. The Mulready name arises from the fact that William Mulready, a well-known artist of the time, was commissioned to illustrate the part of the precut sheets and envelopes which corresponded with the face area.