Seiyun

Seiyun, or the Kathiri State of Seiyun, was a state/sultanate located between the Qu'aiti State of Hadhramaut and Mahra state, all once part of Aden Protectorate.  File:Kath Seiyun 3 4A.jpg|1951 ¾ anna value. File:Kath Seiyun 1.5A.jpg|1951 1½a value. File:Kath Sieyun 5r.jpg|1951 5 rupee value. File:Kath Seiyun 50c surch.jpg|1951 "50 CENTS" surcharge. File:Kath Seiyun younger 2sh.jpg|1954 2/- definitive. 
 * In 1942, engraved definitives were released. These were denominated in annas and rupees.
 * In 1946 a set of two Victory surcharges was released.
 * From 1949 to 1953, British omnibus issues were released: Silver Wedding, UPU and Queen Elizabeth II coronation.
 * Meanwhile in 1951, currency was changed to cents and shillings with several old definitives surcharged in new values.
 * In 1954, the old definitive designs were reused now with the portrait of the new (young) sultan. Three new values were added in 1964.

South Arabia
In 1963, the larger eastern states of the Aden Protectorate formed the country of South Arabia, again as a British protectorate. The Kathiri State of Seiyun continued to issue their own stamps.  File:South Arabia ovpt on Seiyun.jpg|1966 15f first SOUTH ARABIA surcharge. File:Kath Seiyun Sout Arabia ovpt.jpg|1966 5f second SOUTH ARABIA surcharge. File:Kath Seiyun Olympics.jpg|1966 25f Olympics surcharge. File:Kat Seiyun satellite imp.jpg|1966 25f ITU imperf. File:Kathiri State Seiyun flowers.jpg|1966 15f Churchill paintings. 
 * In 1966, the previous definitives were surcharged in new values, all in fils, with SOUTH ARABIA and "Aden" blocked out.
 * Later in 1966, new surcharges were issued, the lines set differently from the previous set and the Arabic inscriptions taller than before. These were the ones surcharged for the Olympics and World Cup issues, if a comparison is needed.
 * Also in 1966, an Olympics surcharged set was released, each with older Summer games noted.
 * Also in 1966, stamps were surcharged for England's World Cup win, with either CHAMPIONS / ENGLAND or FOOTBALL / 1966
 * In late 1966, Seiyun began its run of topical issues, including souvenir sheets and imperfs. These were all additionally inscribed "SOUTH ARABIA". There were also two surcharged sets in 1967 for World Peace and American astronauts.

Kathiri State in Hadhramaut
In 1967, the sultanate's name was changed. We currently can find no reason for the change but suspect it was done to irritate their Qu'aiti neighbors.  File:Kath Hadrahamut painting A.jpg|1967 200f Degas paintings. 
 * Topicals continued to be cranked out at a frightening rate.
 * In November 1967, South Arabia including the Kathiri State became part of the '''People's Republic of Southern Yemen/People's Democratic Republic of Yemen.

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