The Ōtsuka Lōtec No. 7.5 tells time through three separate windows rather than conventional hands: jumping hours, minutes and seconds each have their own rotating display. The current version pairs that unusual readout with a 40 mm steel case and an automatic Miyota movement fitted with an in-house jumping-hour module. Fratello’s Thor Svaboe found it wore compactly for its diameter, while noting that the display takes a little time to read naturally.
How the No. 7.5 displays the time
Look through the three apertures to read the time: the hour changes in a jump, while separate discs indicate minutes and seconds. Unlike the earlier No. 7, whose minutes and seconds discs shared an axis, the No. 7.5 gives hours, minutes and seconds independent displays. The seconds disc is more than decoration: webChronos reviewer Shun Horiuchi described using it to check whether the mechanism was running.
The unusual layout has a practical learning curve. Svaboe wrote in Fratello’s January 2024 hands-on report that the display became legible once he had grown accustomed to its appearance; that is his experience, not an independent test.
Current specifications and price
| Specification | Ōtsuka Lōtec No. 7.5 |
|---|---|
| Movement | Automatic Miyota 82S5 base movement with an in-house jumping-hour module |
| Jewels and frequency | 24 jewels; 21,600 vibrations per hour |
| Power reserve | Approximately 40 hours |
| Case | 40 mm diameter; 11.2 mm thick; 14.8 mm at the highest point; 316L stainless steel |
| Display crystals | Sapphire front crystals and sapphire display back; the hour fisheye lens is custom sapphire |
| Water resistance | 3 ATM |
| Strap | Calfskin; 20 mm lug width |
| Warranty | One year |
| Current listed price | ¥396,000 including tax on the official model page, accessed in 2026 |
The figures above are from the maker’s current No. 7.5 product page. It identifies the specification as the version from 2023 onward, following revisions intended to improve stability and durability. The case changed from SUS303 to SUS316L, mineral glass gave way to sapphire, and the hour lens changed from acrylic to custom sapphire.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minute#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
How the mechanism is built—and how to set it
The automatic Miyota 82S5 is the base movement; Ōtsuka Lōtec adds its own module to create the jumping-hour display. In a 2023 interview, designer and watchmaker Jiro Katayama told Fratello that he designs in-house display modules for Miyota movements. He said a typical module uses about 30 parts, including gears, springs and discs. That is a general description of a typical module, not a part count confirmed specifically for the No. 7.5.
Follow the maker’s winding-direction warning when adjusting the time. The product page says: “Always turn the crown moving the time forward, when setting the time. Don’t turn the crown the other way around when setting the time, for fear you should break it.” In other words, set the time by turning the crown forward; do not turn it backward to adjust the display.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
What it is like to wear
Svaboe reported that the 40 mm watch wore compactly on his wrist and measured its lug-to-lug length at 45 mm. He also found that the custom calfskin strap began stiff and formed to his wrist over time. Those are his January 2024 observations; the stated 45 mm measurement is his own, not a manufacturer dimension.
The case’s maximum height is 14.8 mm, so the watch’s profile deserves as much consideration as its diameter. Its display is also part of the wearing experience: people who enjoy learning a distinctive format may find the separate windows engaging, while anyone who wants to read the time instantly at a glance may prefer a conventional dial.
Free tools Windows power users keep installed
One-click scans. No signup required.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
The 20 mm lug width offers a familiar strap measurement, and webChronos reports that the strap can be replaced. However, the factory strap is specially designed for the watch, and its wire-style lugs mean a replacement should be checked for fit rather than assumed compatible just because it is 20 mm wide.
Design background and model timeline
Katayama told Fratello that the initial inspiration was an 8 mm movie camera. He had started his career as a car and product designer, then acquired a lathe through an internet auction because he wanted to make something himself. He told the publication that watches appealed to him because one person could make them and because people wear watches to express individuality.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
In the same October 2023 interview, Katayama dated the No. 7 launch to 2020, the first No. 7.5 to 2021 and the revised No. 7.5 to 2023. He said the renewal improved the module as well as changing the case material and display crystals.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Price and availability context
The official page lists the current price as ¥396,000 including tax. Fratello’s October 2023 article and webChronos’s January 2024 review each quoted ¥297,000 during their publication periods; those are historical prices, not the current listed amount.
Quick wins for a faster PC:
Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
The model page does not establish current stock, export availability or a sales schedule, so availability outside Japan—or whether the watch can be purchased now—cannot be concluded from the listed specifications. The stated 3 ATM water resistance is modest; the No. 7.5 should not be described as a diving watch.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
