A superb UNMOUNTED MINT " cylinder 1 no dot " control block of 6 with perf type A E/I. A superb UNMOUNTED MINT cylinder 1 no B51173" is in sale since Monday, November 30, 2020. This item is in the category "Stamps\Great Britain\Elizabeth II\Pre-Decimal (1952-1971)". The seller is "bbstampsltd" and is located in Basingstoke. This item can be shipped worldwide.