A superb UNMOUNTED MINT " Control Z36 cylinder 149 dot " control block of 6 with perf type 2 I/E. Variety listed in Stanley Gibbons, only example we currently know of. A superb UNMOUNTED MINT Control Z36 cyli B52594" is in sale since Monday, April 26, 2021.This item is in the category "Stamps\Great Britain\George V". The seller is "bbstampsltd" and is located in Basingstoke. This item can be shipped worldwide.