SG935/8var Indigo Jones Set Missing Phosphor (background White not cream) RARE

1973 3p-5p Inigo Jones. Very fine unmounted o.g. set of two horizontal setenant in pairs with phosphor omitted causing a distinct change of background colour from cream to white. Scarce. Spec. W255/8b SG 935/8var Priced at 500 pounds per pair in Pierron (2005)