Detail from a letter card. These innovative Post Office products spared you from buying stationery and being expected to write at length, because being the same in size as just two postcards you soon ran out of space. '3d' converts to one and a half new pence in Britain's decimal currency which replaced the old Lsd in February 1971. Photographed with a Nikon D700, Nikkor-H 85mm f/1.8, and a Nikon Close-Up supplementary lens no.4T.