NOS Full Set 2026 Otsuka Lotec N°6 号 Double Retrograde By Jiro Katayama "Challenge" Award Winner at GPHG
The New Old Stock (NOS) 2026 Ōtsuka Lōtec No.6 Double Retrograde is a compelling expression of independent Japanese watchmaking, created by industrial designer-turned-watchmaker Jiro Katayama. Distinguished by its unconventional double-retrograde display, the No.6 presents hours and minutes on opposing arched scales, evoking the gauges and instrumentation of vintage machinery—a recurring theme in Katayama’s industrial design language. Powered by a Miyota automatic movement fitted with Katayama’s proprietary retrograde module, the watch combines mechanical ingenuity with striking visual originality.
Its appeal was formally recognized when the No.6 won the prestigious Challenge Watch Prize at the 2024 Grand Prix d’Horlogerie de Genève (GPHG), awarded to the best watch under CHF 3,000. Produced in extremely limited quantities and available primarily through a Japan-only lottery system, the No.6 has become one of the most sought-after independent watches of recent years, celebrated for bringing avant-garde design, authentic craftsmanship, and accessible pricing into a single award-winning creation.
All our watches are thoroughly inspected by our expert watchmaker and come with a 3 months guarantee. However, since this particular piece is New Old Stock from 2026.
- Brand: Otsuka Lotec
- Year: 2026
- Reference: 6
- Material: Stainless Steel
- Movement: Automatic - Miyota 9015
- Bracelet / Strap: Original Otsuka Lotec
- Dimensions : 42mm
- Accessories: Full SET
- Warranty: 1 year
All watches are checked and tested by our watchmaker and guaranteed 90 days. During service, pieces and parts could be needed due to age and are always replaced by original signed parts by our watchmaker. If serviced, we offer a 1 year mechanical guarantee.
This mechanical warranty does not cover damages that the buyer might cause. In regards to vintage models, we cannot guarantee waterproofness or time accuracy unless the watch has been serviced and these requests approved by our watchmaker.
All items are carefully packed and shipped via Fedex express couriers such as FedEx Priority. Your shipment is fully insured, please open the parcel in front of your courier to attest any potential damages caused during transportation. If you do not do this, we cannot guarantee the full refund of your order due to transportation damages. Please keep in mind that for shipments outside the EU, Harbor Watches is required to declare the retail value of the order which might be subject to fees and taxes upon arrival in the destination country. Potential taxes and fees are the responsibility of the customer.
We have a no-questions-asked 5-days return policy for European customers and international customers. Insured return is at the cost of the customer and must be made with Fedex Priority. We will process the refund as soon as we receive the item and can confirm that it is in the same condition as it was when it left our office. For return, please email us at harborwatchesparis@gmail.com
Please note that withdrawal rights do not apply to limited editions. This is because limited editions are sold exclusively during a specific time frame and cannot be resold after a return or refund. Additionally, pre-orders with a time limit cannot be refunded either before or after the pre-order period has ended.