Lot 70520 – 1958 2d red-brown Dollis Hill trial with phosphor in the pulp, part sheet with portions of 11 imperf stamps

1957-72 Dollis Hill trials; 2d red-brown with green phosphor in the pulp, part sheet with portions of 11 imperf stamps, the reverse with annotation made by C. F. Forster who was in the laboratories at Dorris Hill, caused by it slipping on the roll during printing and being partly obscured by another trial piece (S.G. Spec ST5 (2)a), ex Klempka (author of “The Dollis Hill Find”, illustrated p.14).