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At a glance: SBGX355 vs. STGF385
| Specification | SBGX355 | STGF385 |
|---|---|---|
| Collection and movement | Heritage Collection; quartz caliber 9F62 | Heritage Collection; quartz caliber 4J52 |
| Case material | Bright Titanium | Stainless steel |
| Case dimensions | 37.0 mm diameter × 44.6 mm long × 10.6 mm thick | 28.9 mm diameter × 35.4 mm long × 8.8 mm thick |
| Band width and weight | 19 mm; 80 g | 14 mm; 72 g |
| Dial and bezel | Silver-plated Snowflake-pattern dial; blue steel seconds hand | Snowflake-pattern dial; blue seconds hand; bezel set with 44 diamonds |
| Accuracy and water resistance | ±10 seconds per year; 10 bar | ±10 seconds per year; 10 bar |
These are manufacturer specifications. See Grand Seiko’s SBGX355 Japan product page and STGF385 Singapore product page.
How the case size and materials differ
SBGX355: larger, lighter titanium case
At 37 mm across and 44.6 mm from lug to lug, the SBGX355 has the larger footprint. Its Bright Titanium case measures 10.6 mm thick, weighs 80 g, and takes a 19 mm band. The dimensions make it the more conventional choice for someone seeking a mid-size watch, though wrist fit depends on wrist shape as well as diameter.
STGF385: compact steel case with a diamond bezel
The STGF385 measures 28.9 mm across, 35.4 mm long, and 8.8 mm thick. It is made of stainless steel, weighs 72 g, and has a 14 mm band. Its smaller proportions and diamond-set bezel give it a different visual balance from the SBGX355; the bezel carries 44 diamonds. Neither model is simply a scaled version of the other.
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- 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.
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- 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.
Dial design: the shared Snowflake inspiration
Grand Seiko says both dials interpret wind-shaped snow around the Hotaka mountains, visible from the Shinshu Watch Studio. The SBGX355’s Japan product page describes a silver-plated dial and says its appearance is created without white paint; its blue steel seconds hand provides a contrasting accent. The STGF385 also has a blue seconds hand, but pairs its patterned dial with the diamond-set bezel. These are the manufacturer’s descriptions of the design.
Grand Seiko’s UK product page describes the SBGX355 as “The 37mm quartz ‘Snowflake,’ reflecting the beauty of driven snow.”
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- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Movements, accuracy, and everyday specifications
The SBGX355 uses quartz caliber 9F62, while the STGF385 uses quartz caliber 4J52. Grand Seiko specifies ±10 seconds per year for each and 10 bar water resistance. Those shared figures make accuracy and water-resistance ratings less useful as a deciding point than case fit, material, movement reference, and styling.
The SBGX355 Japan page states that its battery lasts approximately three years and confirms a date display. That battery-life figure is specific to the SBGX355; the cited STGF385 product page confirms caliber 4J52 but does not state battery life.
Rank #3
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- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Japan and Singapore prices
Grand Seiko’s Japan pages list the SBGX355 at ¥572,000 and the STGF385 at ¥825,000. Grand Seiko’s October 2025 Japan price revision list also gives those Japan-market figures. Separately, Grand Seiko Singapore lists the STGF385 at SGD 7,700. These are different market currencies and should not be treated as a direct price comparison or as US pricing. Check the relevant local Grand Seiko site or retailer for current pricing and availability.
Sources: SBGX355 Japan product page, Japan price revision list effective October 2025, and STGF385 Singapore product page.
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
Which quartz Snowflake suits you?
- Choose the SBGX355 if you want the larger 37 mm profile, a Bright Titanium case, a 19 mm band, and the 9F62 movement with a date display.
- Choose the STGF385 if you prefer a much smaller 28.9 mm case, stainless steel, and a bezel set with 44 diamonds.
- For either model, the stated accuracy is ±10 seconds per year and water resistance is 10 bar, so those specifications do not distinguish one from the other.
Confirm fit in person if possible: the case diameters and lug-to-lug lengths differ substantially, and the smaller STGF385’s bezel treatment changes its appearance beyond the difference in dimensions.
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.
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- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
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.
