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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →The Seiko Prospex Speedtimer SFJ001 is a solar chronograph built around Caliber 8A50, which measures stopwatch elapsed time in 1/100-second increments. Seiko announced the range on June 5, 2023, with worldwide boutique and select-retailer availability planned from July 2023; “new” describes its launch, not a 2026 release. Seiko’s announcement and its current product-family page identify the SFJ001 as part of the 1/100 sec Solar Chronograph family.
What is the Seiko Prospex Speedtimer SFJ001?
SFJ001 is the reference for Seiko’s Prospex Speedtimer 1/100 sec Solar Chronograph. Its defining feature is the solar Caliber 8A50: the stopwatch function measures elapsed time in 1/100-second increments. This is distinct from the more familiar V192-powered solar Speedtimer chronographs, which Seiko describes with a 60-minute chronograph, a 24-hour subdial and a power-reserve indicator shown at the touch of a button. Check the movement and reference when comparing models; the Speedtimer name covers different layouts and functions. Seiko’s product-family page
How to read the 1/100-second chronograph
The dial separates the stopwatch’s three units across dedicated counters. Seiko says this arrangement is intended to support legibility; that is the manufacturer’s design rationale, not an independent readability test.
- 2 o’clock: 1/100-second counter.
- 10 o’clock: 1/10-second counter.
- 12 o’clock: seconds counter.
The subdial at 6 o’clock serves two purposes. In normal timekeeping it displays hours and minutes. While the stopwatch is running, it becomes a 60-minute counter; Seiko’s release says the hour hand is hidden beneath the minute hand during stopwatch use. Seiko’s June 2023 announcement
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- VS75 Quartz Movement: Powering the modern solar chronograph watch is Japan VS75 quartz movement, which is assembled in Japan, providing precise and accurate time keeping, with a precision rate of +2 to−2 seconds a day. And the life span lasts more than 10 years
- Special Design: This stainless steel watches features a 41 mm brushed and polished 316L stainless steel case with a panda textured dial and skeletonized hand. Additional complications include three sub-dials, date window and black ceramic dial for velocity measurement purpose
- Luminous Watch: Using Japan Luminous C3 material, the luminous hand and hour mark in green glowing can last for at least 5 hours in dark. Sapphire crystal glass with anti-reflective coating on inner surface. Waterproof design allows this diving watch to go to depths of 200 meters
- Premium Workmanship: Tactical frog vs75 watch with finest workmanship, striking outlook, screw down crown and fold over clasp with safety and fine tune function is a classic chronograph watch for collection. A must have for tactical frog watch and great choice for watch lovers
- Men's Watches: The striking chronograph watch has tremendous wrist presence. Wears exceptionally well for formal events thanks to its fashionable (yet modern) looks. Swap in a colored strap and you can rock this piece during casual and sporty occasions
A 1/100-second display means the stopwatch can register elapsed time to hundredths of a second. It does not, by itself, establish that every user can start, stop and read the watch with laboratory-level precision. Seiko’s materials describe the function and dial arrangement, not an independent accuracy test.
SFJ001 specifications published at launch
The figures below are from Seiko’s June 5, 2023 announcement. The release cautions that specifications and price information are as of its publication date and may change; consult the applicable regional listing for current details.
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- Set Includes: Watch, box, and warranty card included
- Drive Type: Quartz (solar powered)
- Accuracy: within ±20 seconds per month
- Country of Origin: Japan (Made in Japan)
| Specification | SFJ001 |
|---|---|
| Movement | Solar Caliber 8A50 |
| Case and bracelet | Stainless steel |
| Crystal | Curved sapphire crystal with inner anti-reflective coating |
| Water resistance | 10 bar |
| Magnetic resistance | 4,800 A/m |
| Case diameter | 42.0 mm |
| Case thickness | 12.9 mm |
These dimensions give a useful starting point for judging fit, but diameter alone does not determine how a watch wears; the supplied announcement does not state lug-to-lug length. Seiko also describes specially designed pushers inspired by the handling of its 1960s stopwatches. That is a manufacturer design claim, rather than a hands-on assessment. Seiko’s announcement
SFJ001 versus the regular solar Speedtimer
The quickest way to distinguish the SFJ001 from a V192 solar Speedtimer is the movement and stopwatch display. Seiko’s published descriptions establish these differences:
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- Men's luxury timepieces with technical advancements and a sporty style
- 1/5 Second Chronograph Measures up to 60 Minutes, 12/24 Hour Time, Date
- Silver-Tone Stainless Steel
- Spherical Mineral Crystal
- 100 Meters Water Resistant and 5 Year Limited Warranty
| Feature | SFJ001 / Caliber 8A50 | V192 solar Speedtimer family |
|---|---|---|
| Stopwatch measurement | Elapsed time in 1/100-second increments | 60-minute chronograph |
| Additional stated display | Separate 1/100-second, 1/10-second and seconds counters; 6 o’clock subdial becomes a 60-minute counter during stopwatch use | 24-hour subdial and power-reserve indicator displayed at the touch of a button |
This is a comparison of Seiko’s stated movement functions, not a complete specification comparison between every Speedtimer reference or regional variant. For a specific alternative such as the SSC813, confirm the exact reference and regional product page before comparing case dimensions, crystal, water resistance or fit. Seiko’s product-family page
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Release date, variants and current availability
Seiko announced the 8A50 range on June 5, 2023, and said it would be available at boutiques and select retail stores worldwide starting in July 2023. That historical launch information does not establish whether the SFJ001 is currently in stock, what it costs in a particular market, or which sellers are authorized today. Check a current local Seiko listing or retailer for those details.
Rank #4
- Package includes: body, box and warranty card
- Solar Powered
- Time accuracy: monthly difference from 20s to -20s
- Working time: about 6 months
- Orient Mako
The announcement also named SFJ003 as a regular 1/100-second model. SFJ005, an Analog Quartz 40th Anniversary edition, and SFJ007, a World Athletics Championships Budapest 23 edition, were each announced as limited to 4,000 pieces worldwide. These are release details, not evidence of present availability. Seiko’s 2023 release; Seiko’s product-family page
Quick Recap
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- Orient VS752 Solar Quartz Chronograph Movement
- 42.8mm Case Diameter 48.1mm Lug to Lug length
- 22mm Lug Width
- Scratch Resistant Sapphire Crystal
- 200m Water Resistance (Appropriate for Skin-Diving Only)
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.
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