A affectionate term for many of the Post Office's 'High Value' stamps depicting Carrickfergus, Caernarvon, Edinburgh and Windsor Castles. The first set was issued in 1955 with 2/6d, 5/-, 10/- and £ values. The last set to be issued in 1992 consisted of £1, £1.50, £2, £5 denominations.