Looking for more info about this car, I found the page of "Fujitsubo Motors Factory" (Fujitsubo Giken Kogyo) located at the beginning in Hakata-ku, Fukuoka. According to that page, this car was made by Isamu Fujitsubo.
"Birth of a club and racing activities
MRCF is an abbreviation for Mastery Racing Club Fukuoka, and President Isamu Fujitsubo, who established Fujitsubo Giken Kogyo in Yokohama City, Kanagawa Prefecture in 1955, created an organization called MRC and was engaged in racing activities. At the Gymkhana tournament of Oiso Long Beach sponsored by MRC around 1967, when our president, Lady Fujitsubo, who came to the area from Fukuoka, happened to participate in the competition with a B10 type Sunny 4-door sedan borrowed from an acquaintance, he performed better than the owner of the car. This was the starting point for racing activities.
With the advice of Mr. Isamu, President of Fujitsubo Giken, he added Fukuoka's F to the name of MRC and launched an organization called MRCF in 1968. JAF official recognition, Bridgestone, Mobile Oil Fukuoka, Toyota Corolla Fukuoka, Nishinippon Shimbun, etc. Jim Kana and the race were a great success, sponsored and sponsored by local companies such as Sports Nippon Shimbun and Yamaguchi Mitsubishi Motors.
Gymkhana
Showa consists of 44 rounds to participate actively in the gymkhana competition, Subaru Ff -1 , Honda S 800 , Beret GT, ran in, such as Familia. The venue used the driving schools and airfield sites in each region, and was sponsored by MRCF and racing teams in each region.
Gymkhana car (base, Honda N) produced by Lady Fujitsubo. (...) We made several Gymkhana competition cars based on such light cars and asked MRCF club members to ride them. Due to the light weight of the car, we have achieved many good results.
From what I understood, Fujitsubo Giken Kogyo was located in Fukuoka and then moved to Yokohama.
They set a racing club MRCF (Mastery Racing Club Fukuoka, before known as MRC) located in Fukuoka where they ran these Gimkana cars they made (and they tune other pilot's cars).
