GREAT BRITAIN 1959 SG605a WATERMARK ERROR. The item "GREAT BRITAIN 1959 SG605a WATERMARK ERROR MNH" is in sale since Wednesday, June 17, 2009. This item is in the category "Stamps\Great Britain\Elizabeth II\Pre-Decimal (1952-1971)". The seller is "rossshiells" and is located in LONDON, London. This item can be shipped worldwide.