Jiro Katayama, the independent designer behind Otsuka Lotec, came to watchmaking almost by accident. After working in automotive design, helmets, and household appliances, he bought a small lathe at an online auction and taught himself metalworking. Unable to build a car with a machine that size, he turned to making watch cases around 2008. His preference for physical controls over touchscreens continues to shape his designs, while the name Otsuka Lotec reflects his Tokyo roots and affinity for functional, low-tech machinery.
The No. 8 draws inspiration from an audio mixing console. The hours appear in a window Katayama calls a channel, while the minutes move along a sliding fader from zero to sixty. At the top of each hour, the display advances and the fader returns to zero. A visible flywheel at the upper right moderates the return, while the curved crystal wraps around the case to reveal the mechanism from the side.
Katayama’s other creations, including the No. 5, No. 6, and No. 7.5, share the same industrial aesthetic and unconventional approach to displaying time. The No. 8 takes that philosophy further, turning a familiar piece of audio equipment into an engaging mechanical display.
For collectors, Otsuka Lotec offers a refreshing alternative to traditional luxury watchmaking. Rather than revisiting familiar designs, Katayama builds a distinct visual language inspired by everyday machinery. With its unusual display, visible mechanics, and unmistakable design, the No. 8 is a compelling example of independent watchmaking that prioritizes originality and ingenuity over convention.
Sources: Otsuka Lotec; Monochrome; Hodinkee Japan