essay 1985, 150th Anniversary of Abolition of Slavery, artist's coloured drawings (3, size either 230x160 or 245x175mm.) on card with proposed lettering on tracing paper overlays), as used with modifications for the 25c., 130c. and 150c. values; also overlays for 1986 Reicheubachia overprint (for S.G. 1657/58), preparatory notes for 1986 Halley's Comet pairs, and an artist's essay for a 25c. stamp endorsed "To the year 2,000"