unused 10/- grey and pink, centred to top left, fine mint. S.G. 136, £250

Recommended features

• • 

  • Live like a Rockefeller — Pablo Picasso’s Pomme

    Jonathan Rendell, Christie’s ’story teller’ for The Collection of Peggy and David Rockefeller, looks at a painting that gives him ‘goose-bumps’

• • 

  • 5 minutes with… An early al-Tusi astronomical manuscript

    Islamic art specialist Romain Pingannaud on a 13th-century copy of a key compendium on astronomy and mathemetics