GV - 1924 Block Cypher. Complete set x 10 with Controls. The item "GV 1924 Block Cypher. Complete set x 12 with Controls. Superb unmounted mint" is in sale since Wednesday, July 28, 2021.This item is in the category "Stamps\Great Britain\George V". The seller is "wickham_stamps" and is located in Bromley. This item can be shipped worldwide.