A very fine mint control " M18 perf " block of 4. With a fine partial UNCALENDERED PAPER ERROR due to paper fold. We also only send to confirmed addresses.A very fine mint control M18 perf block of 4" is in sale since Friday, April 26, 2013. 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.