A set of ten buttons, of metal and brightly coloured plastic, of abstract design, labelled OFFICIAL BUTTON NEW YORK WORLD FAIR 1939-40, 5--1in. (2.5cm.), 5--0.5in. (1.5cm.); a set of ten oval plastic buttons moulded with stylised Egyptian silhouettes--1.75in. (4.5cm.), circa 1930s; a collection of metal buttons, each modelled with an exotic Egyptian scene, 19th century, Continental