Full name
Mitsunori Seki

Birthdate
January 4, 1942

Debut
On December 2, 1958, in Tokyo, he lost by points in four rounds to Masao Tominaga.

won the world title
On September 12, 1962, in Tokyo, he beat Veeranid Charoenmuang on points and became the OPBF oriental featherweight champion.

Lost His Title
He did not lose it, he made 11 defenses and retired as monarch of the East

Withdrawal
On January 23, 1968, in London, Englishman Howard Winstone knocked him out in nine rounds when they fought for the vacant World Boxing Council featherweight title.

The Data
Seki unsuccessfully disputed the world title four times, once against Ultiminio Ramos, twice against Vicente Saldívar and once against Howard Winstone