South Arabian Federation, Kathiri State of Seiyun, Stanley Gibbons 69v, Michel 69v, MNH. August 1966 issue History of the Olympic Games, black Berlin 1936 Olympics overprint, inverted gold South Arabia 20f surcharge on 35c deep blue Sultan Hussein and View of Seiyun, choice MNH sheet margin example, only 50 stamps were issued with the inverted gold surcharge, fresh, bright, VF+.  A rare stamp with a 2021 APEX Certificate.

Listed in the 1974 Minkus Catalog as 71a, and in the Aden Specialized Catalog as 69a.