A superb UNMOUNTED MINT left hand marginal " IMPERF " error horizontal pair. We also only send to confirmed addresses. A superb UNMOUNTED MINT left hand marginal IMPERF error" is in sale since Thursday, March 13, 2014. This item is in the category "Stamps\Great Britain\Elizabeth II\Machin Definitives".The seller is "bbstampsltd" and is located in Basingstoke. This item can be shipped worldwide.