Product Description
Offered for sale is an exceptional example of the Ōtsuka Lōtec No. 5 Kai, presented in brand new, unworn condition and accompanied by its complete original set. Dated 2026, this is one of only a small number of examples available outside of Japan.
Founded by Jiro Katayama, Ōtsuka Lōtec has rapidly become one of the most respected names in independent watchmaking. What began as a one-man workshop evolved into an internationally recognized manufacture, earning acclaim from collectors worldwide for its unconventional engineering, industrial design language, and innovative time displays.
The No. 5 Kai represents Katayama’s most technically ambitious creation to date. At its heart is a satellite hour complication, also known as a wandering hour display, where the hour indication travels continuously across the dial rather than advancing in traditional increments. The result is a captivating and highly mechanical display that transforms the simple act of reading time into an engaging visual experience.
The openworked dial reveals much of the underlying mechanism, reinforcing the industrial and engineering-focused aesthetic that has become synonymous with the brand.
Movement & Engineering
Powering the watch is an automatic movement based on the Miyota 90S5, enhanced by Ōtsuka Lōtec’s proprietary in-house satellite hour module.
The complication continuously rotates the hour display across the dial, creating a dynamic and interactive method of timekeeping rarely encountered in modern watchmaking. The execution showcases the ingenuity and technical creativity that have made Ōtsuka Lōtec one of the most discussed independent brands among serious collectors.
Watch Specifications
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Brand: Ōtsuka Lōtec
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Model: No. 5 Kai
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Year: 2026
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Condition: Brand New / Unworn
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Case Material: Stainless Steel
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Case Size: 40.5 mm
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Dial: Openworked
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Movement: Automatic
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Base Calibre: Miyota 90S5
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Module: Proprietary Ōtsuka Lōtec Satellite Hour Module
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Complication: Satellite / Wandering Hours
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Crystal: Sapphire
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Strap: Original Black Calfskin Strap
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Buckle: Stainless Steel
Condition
- Brand new, unworn condition
- No signs of wear
- Complete factory set
- Running within factory specifications
Included in the Full Set
- Original presentation box
- Warranty documentation
- Manuals and accessories
- Complete factory set as delivered
Collector Perspective
- One of the most sought-after modern independent watchmakers
- Innovative satellite hour complication
- Designed and developed by Jiro Katayama
- Japan domestic market model
- Extremely limited production
- Rarely available outside Japan
The No. 5 Kai is more than a timepiece—it is a modern example of independent horology at its most creative, blending industrial design, mechanical ingenuity, and genuine exclusivity.
Why Buy From ASLAN WATCHES
At ASLAN WATCHES, we focus on transparency, trust, and long-term collector relationships.
- Physician-owned luxury watch company
- 100% authenticity guaranteed
- Carefully curated inventory
- Honest, accurate representation
- Available before and after the sale for guidance and support
Our goal is to provide a smooth and confident ownership experience from inquiry through delivery.
Shipping & Authenticity
- 100% Authenticity Guaranteed
- Fully insured overnight shipping
- Professional packaging
