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The Oris Big Crown ProPilot X Calibre 115 is a large, lightweight titanium watch built around an unusually exposed hand-wound movement. Its 240-hour reserve and open mainspring make it compelling as a piece of mechanical design; its 44 mm case and busy skeletonized display make it a less obvious choice for anyone seeking the quick readability of a conventional pilot’s watch.
What makes the Calibre 115 different?
The defining feature is not just the movement’s 10-day reserve, but how visibly the watch presents it. The manually wound Calibre 115 is designed as an open-worked movement, with the mainspring exposed rather than hidden behind a conventional dial. Russell Sheldrake, reviewing the watch hands-on for Oracle Time on October 3, 2019, wrote: “When I got my hands on the model recently, the first thing that struck me was the unique feature about this specific skeleton dial that you really don’t see often enough: the mainspring is completely uncovered.” (Oracle Time)
As Sheldrake describes it, winding lets the wearer see the spring gather around its pinion while the reserve indicator shows the remaining power. That visual connection between winding and stored energy is the watch’s strongest idea: the mechanism is part of the display, not simply a device operating behind it.
Hodinkee’s September 5, 2019 introduction explains that Oris conceived the movement as open-worked and built the multi-piece case around it. It also describes the reserve scale as non-linear, giving more visual attention to the lower-reserve portion of the range. (Hodinkee)
#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 10-day power reserve works
Oris specifies a 240-hour power reserve, or 10 days, for the manually wound Calibre 115. The reserve indicator at 3 o’clock tracks the remaining stored power; the scale is non-linear rather than a simple evenly divided countdown. The watch also has stop-seconds, so the seconds hand stops when the crown is pulled for setting. These are manufacturer specifications, not results from an independent duration test. (Oris US product listing)
Ten days between windings is useful if you rotate watches or prefer not to wind daily, but it does not make the ProPilot X automatic: it still needs to be wound by hand. The long interval is best understood as added flexibility, while the exposed spring and indicator make winding part of the experience.
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.
Is it practical as a pilot’s watch?
It is aviation-inspired, but its priorities differ from those of a traditional pilot’s instrument. Sheldrake characterizes the X as aviation-inspired rather than a watch intended for actual flying. Hodinkee likewise notes that maximizing legibility is not a primary concern. The open movement and visual complexity are the attraction, but they compete with the clear, immediate time reading many buyers expect from a pilot watch.
Its display comprises central hour and minute hands, small seconds at 7:30, and the power-reserve indicator at 3. If you want a striking mechanical showpiece and are comfortable taking an extra moment to read the dial, that arrangement may suit you. If legibility at a glance is the main requirement, the skeleton architecture is a meaningful compromise rather than a minor styling detail.
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.
Size, titanium and wrist fit
The case measures 44.00 mm across and is made from multi-piece titanium. Sheldrake found the watch exceptionally light despite its diameter, and described the angular, sandblasted case and bracelet as modern and sporty. Those are his subjective impressions, not a published weight measurement or a guarantee of comfort on every wrist. The size remains substantial, so trying it on is sensible if you are unsure about 44 mm.
The case has a domed sapphire crystal on both sides with double-sided anti-reflective coating and a see-through sapphire caseback. Oris specifies 10 bar water resistance. That rating is a product specification, not evidence that an individual example has been tested in use. (Oris UK product listing)
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
Specifications and available configurations
| Specification | Oris listing details |
|---|---|
| Case | 44.00 mm, multi-piece titanium |
| Crystal and caseback | Domed sapphire front and back, double-sided anti-reflective coating; see-through sapphire caseback |
| Water resistance | 10 bar |
| Movement | Manually wound Oris Calibre 115; 21,600 A/h (3 Hz) |
| Power reserve | 240 hours (10 days), with non-linear indicator |
| Display | Central hours and minutes; small seconds at 7:30; reserve indicator at 3; stop-seconds |
| Interhorn width | 22 mm |
| US configuration | Reference 01 115 7759 7153-Set5 22 04TLC; grey dial and leather strap |
| UK configuration | Reference 01 115 7759 7153-Set7 22 01TLC; grey dial and titanium bracelet |
Oris’s US and UK listings describe different strap configurations, so they are not identical offers. The 22 mm interhorn width gives a useful starting point for strap options, but confirm that a replacement strap’s shape and fittings suit the specific watch.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Price and warranty: check the regional listing
When accessed in 2026, Oris’s US listing showed USD 9,000 for the leather-strap configuration; its UK listing showed GBP 6,700 for the titanium-bracelet reference. These are regional official list-price snapshots for different references, not like-for-like offers or a guide to current secondhand prices. Confirm the market, configuration and price on the relevant US or UK product page before buying.
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.
Both official listings state a two-year warranty and describe free extensions through MyOris. The US listing says this configuration can be extended to five years. Registration requirements and terms can vary by region, so check the applicable listing rather than assuming the same extended duration everywhere.
Quick Recap
Who should consider the ProPilot X Calibre 115?
- It may appeal if you value visible watchmaking, enjoy manually winding a watch, and want a long reserve presented as part of the dial design.
- Think carefully if you prefer a smaller case, rely on instant conventional pilot-watch legibility, or want an automatic movement.
- Before buying compare the exact regional reference, strap or bracelet, price and warranty terms, and try the 44 mm case on if fit is uncertain.
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.
