This comparison uses the original Tudor Black Bay Fifty-Eight reference 79030N—not the newer 2025 Black Bay 58—against the Seiko Prospex SPB147J1. Both are specified for 200 m water resistance and about 70 hours of power reserve, but the Seiko is larger by its published diameter. The right choice depends on fit, movement credentials and preferred configuration, not a proven claim that one is objectively better.
Which Black Bay 58 is being compared?
“Black Bay 58” covers more than one reference. The original 79030N is the relevant model for the specifications and historical prices below. Tudor’s archived 2018 sheet lists its 39 mm steel case, MT5402 movement, COSC certification, approximately 70-hour power reserve and 200 m water resistance. Tudor’s archived 79030N specification sheet
A newer Black Bay 58 should not be treated as specification-identical. The 2025 M7939A1A0RU is also 39 mm and rated to 200 m, but uses the MT5400-U, has COSC and METAS certification, and a 65-hour certified reserve. Tudor’s 2025 M7939A1A0RU specification sheet
How do their dimensions compare on the wrist?
The 79030N’s published diameter is 39 mm; the SPB147J1 measures 40.5 mm across, 13.2 mm thick and 47.6 mm lug-to-lug. Those figures make the Seiko larger on paper, but diameter alone does not determine how a watch wears. Thickness and lug span affect how it sits and how far it reaches across a wrist. The retrieved 79030N sheet does not state thickness or lug-to-lug, so a complete dimensional comparison is not established.
Free tools Windows power users keep installed
One-click scans. No signup required.
#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.
If fit is decisive, compare both watches on your own wrist where possible. Check that the lugs sit within the wrist’s edges and that the case height works under sleeves; do not infer Tudor’s missing dimensions from another Black Bay reference.
What do the movements and power reserves tell you?
The original Tudor 79030N uses the automatic MT5402, which Tudor identifies as COSC-certified, with an approximately 70-hour reserve. Seiko specifies an automatic, manually winding 6R35 for the SPB147J1, also with an approximately 70-hour reserve. Seiko gives an accuracy range of +25 to -15 seconds per day on its product page; Tudor’s retrieved 79030N sheet confirms COSC certification but does not state a numerical daily tolerance. Certification and the published figures are useful points of distinction, but they do not establish a head-to-head real-world accuracy result.
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.
For the later M7939A1A0RU, use its own figures: the MT5400-U is COSC- and METAS-certified and has a 65-hour certified reserve. That is a different movement and reserve from the original 79030N; it should not be substituted into a comparison of the earlier reference.
Water resistance, crystal and wearing options
Tudor specifies 200 m (660 ft) water resistance for the 79030N. Seiko specifies 200 m / 660 ft diver’s water resistance for the SPB147J1. These are the manufacturers’ published ratings; the figures alone do not prove that testing protocols or dive-watch certifications are identical, or establish suitability for every use.
The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →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 79030N sheet lists a domed sapphire crystal and options of a riveted steel bracelet, leather strap or fabric strap. Seiko lists a curved sapphire crystal with inner anti-reflective coating and a silicone strap; the SPB147J1 has 20 mm between the lugs. That spacing is a useful fit detail if considering another strap, but verify a replacement’s compatibility with the particular watch and hardware.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should you compare their prices?
Tudor’s archived 2018 Swiss sheet gives VAT-included list prices for the 79030N of CHF 3,400 on the bracelet and CHF 3,100 on leather or fabric. These are historical Swiss prices, not current prices or a universal price guide. Seiko’s product page is from its Indonesian boutique and currently marks the SPB147J1 unavailable; it does not provide a current, matched price comparison with Tudor. Seiko Boutique Indonesia’s SPB147J1 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
For a purchase decision, check current availability and pricing with authorized or local retailers in your market, and compare equivalent configurations and taxes. The available figures do not support a current cross-market price ratio.
Quick Recap
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.
Which one makes more sense for you?
- Consider the original Black Bay 58 79030N if its 39 mm diameter, COSC-certified MT5402 and choice of bracelet or strap configuration suit your preferences.
- Consider the Seiko SPB147J1 if its 40.5 mm diameter and stated case measurements fit your wrist, and you want its silicone-strap setup, 6R35 movement and published accuracy range.
- Compare by exact reference. If the Tudor under consideration is the 2025 M7939A1A0RU, assess its 65-hour reserve and COSC/METAS certification rather than carrying over the 79030N’s movement details.
- Try them on if fit is close. The available 79030N specification sheet does not include thickness or lug-to-lug, so published dimensions cannot settle every wrist-fit question.
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.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
