2 1/2d imperforate with black shift error. Unmounted mint side marginal example, printed on watermarked paper.The item "1961 Post Office Savings. 2 1/2d imperforate with black shift error. MNH" is in sale since Monday, April 5, 2021. This item is in the category "Stamps\Great Britain\Elizabeth II\Pre-Decimal (1952-1971)". The seller is "wickham_stamps" and is located in Bromley. This item can be shipped worldwide.