SG M13 Variety. 1915.
6c on 7 1/2h Carmine. 'Handstamp Double'.
Superb fresh unused with beautiful colour and perforations.
Holcombe Certificate.
Exceedingly Rare and Attractive. Probably Unique.
'Ex. Bute'. (Robson Lowe (London), May 1959, lot 367).