Introduction

You've likely heard about the sensational No.6 watch, which created a stir with its unique pressure gauge feature. Today, however, we're diving into the stunning details of the new Ōtsuka Lōtec No.5 Kai.

This is the first fresh design from renowned watchmaker Jiro Katayama in several years, following his previous iterations—the refined No.7.5 and the praised GPHG Challenge Prize-winning No.6.

Innovative Features

The No.5 Kai proudly showcases the world's tiniest steel ball bearing, one of two custom components crafted by Japan's esteemed micro-engineering firm, MinebeaMitsumi.

Among its features is the 1.5mm diameter bearing that governs the seconds disc, making it not just remarkable, but also the smallest of its type globally. This remarkable engineering feat highlights Katayama's pursuit of innovation in wristwatch craftsmanship.

Aesthetic Design

When it comes to aesthetics, the No.5 Kai draws inspiration from the complex, tool watch designs of Urwerk.

Its satellite hour display introduces an enchanting blend of functionality and creativity—each feature reflects a uniquely Japanese essence that can't simply be likened to Swiss counterparts.

Eye-Catching Crystal and Case

The striking panoramic box sapphire crystal is the first thing that catches the eye on the No.5 Kai.

With a 40.5mm diameter and a sleek 7.6mm height, the case adopts a bezel-less profile that gracefully tapers from its brushed sides. This design boosts the height, presenting the watch at a remarkable 12.2mm—a perfect fit for slipping under most shirts, yet it beckons enthusiasts to explore its unique features.

Unique Time Display

The watch includes a captivating central carousel that spins and showcases the time through satellite hour markers, each representing four printed numerals.

As they transition, they cleverly double as minute pointers on a distinct 120-degree arch of the chapter ring. This innovative display offers not only a unique reading experience but also a stylish talking point for any watch collector.

Craftsmanship and Movement

Building upon Ōtsuka Lōtec’s tradition of ingenuity, the No.5 Kai houses an imaginative, in-house module built upon a 9-series Miyota movement, the 90S5.

While it carries a premium price compared to previous models, it also reflects the substantial craftsmanship behind it.

Notably, had this been a Swiss independent design with similar detailed artistry, the price would likely skyrocket.

Signature Strap

The new watch retains the signature calf leather strap with its characteristic twin-padded channels, reminiscent of previous models but with a modern twist.

Drawing from Jiro Katayama's first No.5 design from 2012, the latest version exhibits the same elegantly-shaped case while introducing futuristic elements, including a knurled crown positioned at 4:30.

Design Evolution

In an exclusive insight shared during a conversation with Katayama, he expressed the evolution of his work, announcing: “This time, I’ve featured satellite hours for a new take on displays.”

This design evolution incorporates two specially designed bearings crucial to the functioning of the watch, revealing intricacy and precision.

Availability

As of now, Ōtsuka Lōtec watches are only accessible in Japan, primarily through a lottery system, similar to the exclusivity that surrounds MB&F's MAD1.

However, Katayama hinted at possible international solutions in the works!

Personal Experience

Adding to the allure, I had a memorable moment during the Geneva Watch Days last year when I allowed a fellow watch enthusiast, Wei Koh, to try on my No.7.5.

It was amusing to see the astonished reaction when he swapped my Ōtsuka Lōtec for a $200,000 Horological Machine; it speaks volumes about the captivating effect of Katayama's creations, which offer avant-garde design without the exorbitant price tag.

Specifications and Pricing

The Ōtsuka Lōtec No.5 Kai tantalizingly combines technology and artistry, with specifications that include a diameter of 40.5mm and a thickness of 12.2mm, a robust 316L brushed stainless steel case, and a stunning open-worked dial featuring wandering satellite hour displays.

Additional specifications include the Miyota 90S5 movement, featuring 25 jewels and a power reserve of 40 hours.

Retailing at approximately JPY 748,000 (around $4,500), this exquisite timepiece is available exclusively in Japan, with a raffle for order allotment scheduled for March 2025.

Will you be among the lucky few to experience the marvel of the Ōtsuka Lōtec No.5 Kai? Stay tuned and keep your eyes on the prize! For further details, visit Ōtsuka Lōtec's official site.