1965 Joseph Lister Discovery Non-phosphor 4d. Brown-red omitted, Pierron GB1272MCa, S.G.667a,

vertical marginal block of 8 from the lower-left corner of the sheet with the cylinder numbers and part of the sheet number, the upper block of 4 with the red-brown colour omitted, fresh, original gum. (Pierron as singles £900, S.G. as singles £2,000)