ŌTSUKA LŌTEC | NO.5 KAI, A RARE BRAND NEW STAINLESS STEEL SKELETONISED WRISTWATCH WITH WANDERING HOURS, CIRCA 2026
Calibre: Miyota 90S5 and in-house satellite hour module, automatic, signed Dial: Skeletonised, signed Case: 40.5mm, stainless steel, screw down case back, signed Strap: Maker's leather, stainless steel buckle, signed Accompaniments: Maker's presentation box, warranty card, instruction manual, greeting card and cleaning cloth Ōtsuka Lōtec | No.5 Kai, a rare brand‑new stainless‑steel automatic skeletonised wristwatch with satellite‑style time display, circa 2026. Includes original watch box, service warranty card, instruction manual, greeting card and cleaning cloth. The Ōtsuka Lōtec No.5 Kai represents a bold evolution in Japan's independent watchmaking landscape, conceived by self‑taught watchmaker Jiro Katayama. The model reinterprets the brand's signature avant garde aesthetic with an inventive satellite hour display. Three cross shaped rotating discs, each carrying four hour numerals, orbit a central axis, while a retrograde minute track arcs across the upper portion of the dial, enhancing legibility and everyday wearability. Housed in a 40.5mm brushed stainless steel case, the watch balances industrial strength with refined restraint. Its slim profile, 7.6mm at the sides and 12.2mm at the highest point, thanks to a pronounced box style sapphire crystal, keeps it compact on the wrist. Power comes from a Miyota 90S5 automatic movement augmented by Katayama's in house module, notable for its technical sophistication. The mechanism employs two MinebeaMitsumi ball bearings, including an ultra small 1.5mm bearing claimed to be the world's smallest used for a seconds display. An additional custom bearing facilitates precise hour changes, while dual reduction gears ensure smooth, jerk free transitions. What truly distinguishes the No.5 Kai is its extraordinary rarity. Remaining committed to Ōtsuka Lōtec's philosophy of deliberate, small batch production, approximately 500 watches produced over nearly two decades, the model is offered exclusively in Japan through sporadic online lotteries on the brand's website, often with very limited availability. This extreme scarcity makes international acquisition especially challenging and has fueled strong demand on the secondary market, where prices regularly exceed retail. Complete examples of the No.5 Kai, including original boxes and accessories, embody a compelling fusion of experimental engineering, retro futuristic design, and hard to obtain domestic exclusivity. For collectors drawn to genuine independent craftsmanship, it stands as a distinctive and highly coveted horological achievement.
