Otsuka Lotec No.5 Kai Watch, Satellite Hour, Stainless Steel, 40.5 mm, Automatic, Unworn
Otsuka Lotec No.5 Kai Watch, Satellite Hour, Stainless Steel, 40.5 mm, Automatic, Unworn
Previously in the house
This piece has found its home
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An unworn Otsuka Lotec No.5 Kai, the maker’s first satellite-hour watch, in which three numeral discs travel around the dial like moons to tell the hour against a fixed minute scale.
The Piece
Otsuka Lotec is the independent Japanese watch brand of Jiro Katayama, known for its retrograde and jumping-hour displays.
The No.5 Kai refines the No.5 of 2012. Its three numeral discs travel around a central bridge against a fixed minute scale. Two stacked reduction gears limit backlash, two miniature ball bearings by Minebea Mitsumi carry the discs, and a box-shaped sapphire crystal 4.6 mm (0.18 in) high leaves the mechanism open to view.
The case is 40.5 mm (1.59 in) across, driven by a Miyota Cal. 90S5 automatic movement with a module made by the maker. The watch is unworn and still wears its protective film, with its box and a warranty card dated October 2026.
Details
- Maker: Otsuka Lotec
- Model: No.5 Kai (5号改)
- Material: Stainless steel case; box-shaped sapphire crystal; black leather strap
- Movement: Miyota Cal. 90S5 automatic with an Otsuka Lotec module, 28,800 vibrations per hour, about 40 hours power reserve
- Measurements: Case 40.5 mm (1.59 in) across; crystal height 4.6 mm (0.18 in)
- Water resistance: Everyday splash resistance only
- Colour: Steel; silver dial; black strap
- Origin: Made in Japan, 2026
- Included: Box; warranty card dated October 2026
Condition
- Grade S in Japan: unused, with no marks from use.
- The watch is unworn, photographed with its protective film in place.
Condition grade S (unused) on the Japanese scale; see Japanese condition ranks, explained.
Authenticity & Care
Case and caseback engravings, dial printing, movement, crown and bracelet are examined together and documented in Japan before dispatch. Every piece carries the Japonista authenticity guarantee. Keep it away from magnets and damp, and have it serviced by a qualified watchmaker before regular wear.
Delivery from Japan
Packed by hand in Japan and shipped insured and tracked by EMS or an equivalent express service. Import duties and taxes, where applicable, are payable on arrival. Every sale is final; please ask anything before you buy, and see our published policy.
Considered offers are welcome through Send an Offer, and each one is reviewed personally. Pieces over $1,000 may be reserved over several payments with Layaway Privilege™.
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Collectors also search: Otsuka Lotec No.5 Kai · Otsuka Lotec 5号改 · Otsuka Lotec satellite hour watch · Otsuka Lowtech 5 watch · Jiro Katayama watch
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