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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11The Seiko Prospex Speedtimer SRQ035 and SRQ037 are 2021 mechanical chronographs with the same automatic Caliber 8R46 and the same listed case dimensions. The main difference is edition status: Seiko limited the SRQ035 to 1,000 pieces and included an extra calfskin strap; the SRQ037 was introduced as a standard Prospex collection model. Their original U.S. prices were $3,200 and $3,000, respectively—not current market prices.
SRQ035 vs. SRQ037: the differences at a glance
| Specification | SRQ035 | SRQ037 |
|---|---|---|
| Seiko designation | Prospex Speedtimer Mechanical Chronograph Limited Edition | Prospex Speedtimer Mechanical Chronograph |
| Edition status | Limited to 1,000 pieces | Standard Prospex collection model in the 2021 announcement |
| Announced availability | November 2021 | November 2021 |
| Original U.S. retail price | $3,200 in Seiko’s September 2021 announcement | $3,000 in Seiko’s September 2021 announcement |
| Extra strap | Additional calfskin strap included, according to Seiko | No additional strap stated in the announcement |
| Movement | Automatic Caliber 8R46 | Automatic Caliber 8R46 |
| Case dimensions | 42.5 mm diameter; 15.1 mm thick | 42.5 mm diameter; 15.1 mm thick |
| Listed resistance | 10 bar water resistance; 4,800 A/m magnetic resistance | 10 bar water resistance; 4,800 A/m magnetic resistance |
Seiko announced both watches on September 28, 2021, with availability planned for November. Its official U.S. announcement describes the SRQ037 as joining the main Prospex collection. That launch-era description does not establish whether either reference is currently in production or available to buy.
What the 8R46 movement offers
Both references use Seiko’s automatic Caliber 8R46. Seiko lists a column wheel and vertical clutch, a frequency of 28,800 vibrations per hour (8 beats per second), a 45-hour power reserve, and 34 jewels. The column wheel and vertical clutch are features of the chronograph mechanism; Seiko says they support the precision and durability associated with the 8R series.
The 8R46 has two sub-dials rather than the three used by the 8R48, with the date window at six o’clock. Seiko also credits MEMS technology with helping make the escapement strong and light, and with supporting precision stability. Those are manufacturer descriptions, not independent performance-test results. On its Speedtimer feature page, Seiko says the reset button returns the hands to zero instantly and in synchronization.
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- Tachymeter Feature: Measure Speed
- Secure Case Back: Screw Type
Shared case and design details
Seiko lists a 42.5 mm steel case that is 15.1 mm thick, with a steel bracelet; both have a super-hard coating. The watches have a double-curved sapphire crystal with an inner anti-reflective coating, a see-through case back, 10 bar water resistance, and 4,800 A/m magnetic resistance. These are Seiko’s stated specifications, not independently verified test results.
The dials connect the models to Seiko’s sports-timing history. The company describes the 1964 Crown Chronograph as Japan’s first chronograph wristwatch and says the new dial design subtly nods to it. Seiko specifically says the SRQ035 dial pays homage to the 1/5th-second stopwatch from 1964.
Rank #2
![SEIKO SBDL085 [PROSPEX SPEEDTIMER Solar Chronograph] Mens Watch Shipped from Japan](https://m.media-amazon.com/images/I/41qNCHkLgqL._SL160_.jpg)
- Item shape: Round
- Power source type: Solar Powered
- Clasp type: Push Button Deployment Clasp
Which one makes more sense?
Choose the SRQ035 for the limited edition
The SRQ035 is the one to consider if the 1,000-piece limit, its specific dial treatment, or the included calfskin strap matters to you. Seiko’s announcement priced it $200 above the SRQ037 in the United States at launch. That difference is historical and does not predict today’s asking price or value.
Choose the SRQ037 if you want the standard-collection version
The SRQ037 shares the movement, case dimensions, and listed resistance specifications, while omitting the limited-edition designation. Seiko positioned it as the standard Prospex collection version at launch. The cited announcement does not state that it came with an extra strap.
Rank #3
- LumiBrite Hands And Markers
- Tri-fold Push Button Release Clasp
- Prospex Speedtimer 1/100 Second Solar Chronograph
- Screwdown Caseback
For a present-day purchase, assess the individual watch
The 2021 announcement establishes original U.S. retail prices, not current prices, current inventory, production status, or used-market value. For a specific listing, compare the actual asking price and region, then check condition, included accessories, service history, and seller credibility. The cited specifications alone do not establish a particular watch’s condition or service needs.
Quick Recap
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.
