Ōtsuka Lōtec
No. 7.5 | A stainless steel jumping hour wristwatch | Circa 2026
Lot Closed
May 13, 01:26 PM GMT
Estimate
5,500 - 8,000 CHF
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Read more.Lot Details
Description
Dial: silvered apertures
Calibre: cal. Miyota 82S5 automatic, 21 jewels
Case: stainless steel, screw-down sapphire crystal display case back
Closure: Ōtsuka Lōtec leather strap and stainless steel buckle
Size: 40 mm diameter
Signed: dial and case
Box: yes
Papers: yes
Accessories: Ōtsuka Lōtec Limited Warranty Certificate, instruction manual and presentation box
The No. 7.5 continues Ōtsuka Lōtec’s exploration of instrument-inspired mechanical display systems, reducing the indication of time to three distinct apertures arranged across a stark monochromatic dial. Produced in limited quantities by Jiro Katayama, the model reflects the independent Japanese maker’s emphasis on engineered utility and unconventional mechanical presentation.
Hours are displayed digitally through the left aperture, while the upper right register indicates minutes across a continuously advancing scale. A smaller rotating seconds display completes the composition, each element housed within deeply recessed circular frames machined directly into the dial surface. The result is highly architectural, recalling industrial gauges and laboratory instrumentation rather than traditional watch design.
The restrained bead-blasted steel case and exposed lug structure further emphasise the watch’s utilitarian identity. Beneath the sapphire display back, the automatic Miyota movement contrasts with the highly original indication system visible dial-side. Mechanically inventive yet visually disciplined, the No. 7.5 exemplifies the growing confidence of contemporary independent Japanese horology.