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Biver’s AB is a new 38 mm steel wristwatch built around the brand’s first hand-wound calibre. Its JCB-004 movement runs for 120 hours, resets the seconds hand when the crown is pulled, and is finished in white and yellow gold. The watch combines an onyx-and-gold dial with a highly adjustable five-link steel bracelet, includes an anthracite Bahia calf strap, and carries a four-year warranty.
What the Biver AB is
The AB is Biver’s manually wound steel model and the company’s first 38 mm steel case. Biver lists it in its catalogue as “Manual wind AB 38mm – Steel.” The case is 38 mm in diameter and 9.8 mm thick, with 8 ATM water resistance. That combination gives the AB a compact profile while retaining everyday splash and swimming resistance within the limits of its rating.
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Biver’s official product page describes the watch this way: “The AB was made under pressure and that’s why it can take yours.” The model was presented as a new release in launch coverage by Europa Star.
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Case and dial design
38 mm steel case
The case is stainless steel, measuring 38 mm across and 9.8 mm thick. Its 8 ATM water-resistance rating is published by Biver; the rating does not make the watch a dedicated diving instrument, so activities involving pressure or repeated water exposure should follow the brand’s care guidance.
#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.
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- 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.
Onyx and 18k gold dial
The dial uses a dark-grey treated solid 18k 2N gold centre surrounded by a polished onyx outer ring. A gold minute track completes the layout. The result is a material-focused dial rather than a heavily decorated display, with the dark centre and reflective onyx providing contrast for the hands and indications.
JCB-004: Biver’s first hand-wound calibre
The AB is powered by calibre JCB-004, designed specifically for this watch and identified by Biver as its first hand-wound movement. The published functions are hours, minutes and seconds.
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.
Five-day power reserve
JCB-004 stores 120 hours of running time, equivalent to five days. Biver shows the remaining reserve on a slim arc at 12 o’clock, with a gold pin indicating the level. Because the movement is manually wound, the owner replenishes the reserve through the crown rather than relying on a rotor.
Zero-reset seconds
Pulling the crown activates a zero-reset mechanism for the small seconds. The seconds hand returns to zero, allowing the watch to be synchronized more precisely with a reference time before the crown is pushed back in and the movement resumes.
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.
Precious-metal movement architecture
The main plate and bridges are made from PD210 white-gold alloy. The gear train uses 2N yellow gold. These materials are part of the movement’s construction and finishing specification, not merely dial decoration, and distinguish the AB’s calibre from a conventional industrial steel-and-brass architecture.
Bracelet, strap and finishing process
Five-link steel bracelet
The supplied bracelet contains more than 300 parts and combines brushed and polished surfaces across its five-link construction. Its patented easy-adjust link changes the fit by half a link, specified as 0.4 mm. That incremental adjustment can help fine-tune comfort when a full-link change is too large.
Rank #4
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- 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
Included calf strap
Biver also includes an anthracite Bahia calf strap, giving the owner a less formal alternative to the integrated steel bracelet without requiring a separate purchase.
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One watchmaker, two assemblies
Biver says each watch is built from start to finish by one watchmaker. The watch is assembled twice, fully stripped and cleaned between builds, then tested for water resistance, power reserve and chronometry for three weeks before leaving the atelier. These are the brand’s stated production and testing procedures; no independent test result is provided on the product page.
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.
Biver AB specifications
| Specification | Published detail |
|---|---|
| Reference/model | AB, “Manual wind AB 38mm – Steel” |
| Case material | Steel |
| Diameter | 38 mm |
| Thickness | 9.8 mm |
| Water resistance | 8 ATM |
| Movement | Biver JCB-004, hand-wound |
| Functions | Hours, minutes and seconds |
| Power reserve | 120 hours |
| Seconds-setting feature | Zero-reset when the crown is pulled |
| Main plate and bridges | PD210 white-gold alloy |
| Gear train | 2N yellow gold |
| Dial | Dark-grey treated solid 18k 2N gold centre, polished onyx outer ring, gold minute track |
| Bracelet | Five-link steel; more than 300 parts; patented 0.4 mm half-link adjustment |
| Additional strap | Anthracite Bahia calf |
| Warranty | Four years |
Availability, price and how to order
The AB is offered through Biver’s worldwide retail partners and directly through Biver. The official product page provides “Register your interest” and “Enquire” actions. The captured page does not publish a numeric retail price, and its prices are stated as excluding taxes, so the final amount and lead time depend on the buyer’s market and should be confirmed with Biver or an authorized retailer.
- Open Biver’s official AB product page.
- Use “Register your interest” or “Enquire” to request current pricing, taxes applicable to your country and availability.
- If purchasing through a retailer, verify that it is an authorized Biver partner and ask the retailer to confirm the four-year warranty coverage.
- Confirm whether the quoted configuration includes both the steel bracelet and anthracite Bahia calf strap, as listed in Biver’s specification.
Biver’s broader model listing is available in its official watches catalogue.
Quick Recap
Who the AB is for
- Manual-winding enthusiasts: The five-day reserve reduces winding frequency while preserving the daily interaction of a hand-wound watch.
- Precision-minded owners: The zero-reset seconds function supports synchronization to a reference time.
- Smaller-case buyers: At 38 mm by 9.8 mm, the steel case offers a restrained footprint compared with larger high-complication watches.
- Material and finishing collectors: The onyx-and-gold dial, precious-metal movement components and labor-intensive bracelet provide the AB’s visual and mechanical focus.
