Beast the Barbarian 1/7/90 Tokyo Korakuen Hall
*Recognized as first WWA Brass Knuckles Heavyweight Champion.
Atsushi Onita 1/7/90 Tokyo Korakuen Hall
Gregory Veritchev 2/27/91 Tokyo Korakuen Hall
*WWA Brass Knuckles Heavyweight Title becomes WWA Martial Arts Heavyweight Title.
Atsushi Onita 5/29/91 Tokyo Ota Ward Gym
Big Titan 1/15/92 Kobe World Hall
Tarzan Goto 1/30/92 Osaka Prefectural Gym # 2
Leon Spinks 3/25/92 Tokyo Korakuen Hall
Atsushi Onita 5/24/92 Tokyo Ariake Coliseum
The Sheik 6/25/92 Sapporo Nakajima Sports Center
*Vacated due to injury
Tiger Jeet Singh 8/92
*Rewarded by The Sheik
Atsushi Onita 9/19/92 Yokohama Stadium
*Replaced by FMW Brass Knuckles Heavyweight Title.
Atsushi Onita 8/22/93 Osaka Nishnomiya
*Defeated Mr. Pogo to become first FMW Brass Knuckles Heavyweight Champion.
Mr. Pogo 1/6/94 Tokyo Korakuen Hall
Atsushi Onita 9/7/94 Sapporo Nakajima Sports Center
Mr. Pogo 1/21/95 Sendai Miyagi Sports Center
Atsushi Onita 5/4/95 Nagoya Aichi Budokan
*Vacated title on 5/5/95 after Retirement.
Hayabusa 6/27/95 Tokyo Korakuen Hall
*Defeated Hisakatsu Oya, and then vacated on 6/27/95 due to injury.
The Gladiator 9/26/95 Tokyo Korakuen Hall
*Defeated Hayabusa in the finals of a 8 Man Round Robin Tournament and later vacated due to injury.
Super Leather 2/23/96 Tokyo Korakuen Hall
*Defeated Hisakatsu Oya for vacant title.
The Gladiator 5/27/96 Fukuoka Hakata Star Lanes
* Title is unified with FMW Independent Heavyweight Title after defeating W*ING Kanemura on 12/11/96.
Masato Tanaka 9/28/97 Kawasaki Stadium
Mr. Gannosuke 1/6/98 Tokyo Korakuen Hall
Hayabusa 4/30/98 Yokohama Bunka Gym
Kodo Fuyuki 11/20/98 Yokohama Bunka Gym
*Vacated on 5/18/99 due to injury
Yukihiro Kanemura 5/18/99 Tokyo
*Rewarded by FMW Commissioner Kodo Fuyuki
Hayabusa 8/23/99 Tokyo Korakuen Hall
*FMW Brass Knuckles Heavyweight Championship is retired on 8/25/99.