unused  -- 3c. on 16c. chestnut and ultramarine, variety surcharge double, lightly mounted mint, fine; scarce. B.P.A. Certificate (1948). S.G. 38b, £500. Photo
unused -- 3c. on 16c. chestnut and ultramarine, variety surcharge double, lightly mounted mint, fine; scarce. B.P.A. Certificate (1948). S.G. 38b, £500. Photo

Details
unused -- 3c. on 16c. chestnut and ultramarine, variety surcharge double, lightly mounted mint, fine; scarce. B.P.A. Certificate (1948). S.G. 38b, £500. Photo