Sakura Seiki Petal (complete set). I B Spy camera

Sakura Seiki Petal camera.
This camera, regarded by the Guinness Book of Records as the world's smallest camera, weighs only 90 grams, has a diameter of 2.7 cm and a depth of 1.5 cm. It can take six round photos on film cut to a diameter of 2.5 cm. The camera is equipped with a 12mm fixed-focus lens and an f/5.6 aperture, and has a small external viewfinder. The shutter offers an instant mode with a 1/50 second shutter speed and a Bulb setting, without film transport or a mechanism to prevent double exposure.
The model shown is engraved on the back with "MIOJ", which stands for "Made in Occupied Japan". In the period from the end of the war until 1951, the US required this marking on all exported Japanese products instead of the traditional "Made in Japan".
The shutter responds correctly; the lens and viewfinder are clear
The documentation, supplied in a wooden box, is unique in that it fits on a single page, printed on rice paper.
The photos form a single cohesive unit with the description.