If you want an automatic chronograph with an integrated-bracelet sports-watch design, the Tissot PRX 42mm Automatic Chronograph, reference T137.427.11.011.01, is a documented alternative to consider. It is not a visual or dimensional stand-in for the mechanical Seiko Speedtimer: its angular PRX styling is a different proposition. The right comparison depends on whether you want another automatic chronograph, a similar look, or a lower price.
Which Seiko Speedtimer is this comparison about?
This article concerns Seiko’s mechanical Prospex Speedtimer chronographs, not the separate solar-powered Speedtimer models. Seiko’s UK mechanical-chronograph page identifies references SRQ047, SRQ051, SRQ053 and SRQ055 in the 8R48 movement family. Seiko describes the 8R series as using both a vertical clutch and a column wheel, mechanisms associated here with the chronograph’s operation and durability. See Seiko’s official mechanical Speedtimer page.
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Those reference numbers identify models in the line, not interchangeable specifications. Case dimensions, price and availability should be checked against the exact reference and the buyer’s region before making a numerical comparison.
The documented automatic alternative: Tissot PRX 42mm Chronograph
Reference T137.427.11.011.01
Tissot’s US product page lists this PRX as a 42 mm automatic chronograph powered by the Valjoux A05.H31 caliber. It has three chronograph registers and a date display, a 65-hour power reserve, a sapphire crystal and 100 m water resistance. These are manufacturer specifications for this specific reference, not independent test results. Check Tissot’s official US product page for the current listing.
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The key difference is design. The PRX has an angular case and integrated-bracelet sports-watch appearance. Choose it if that style appeals to you alongside an automatic chronograph; do not buy it expecting the Speedtimer’s proportions or vintage tachymeter-chronograph look. The available specifications do not establish that it is cheaper than a particular Speedtimer reference.
How to compare the PRX with a mechanical Speedtimer
Use the exact references and listings you can buy in the same region. The sources cited here do not provide enough comparable detail for every Seiko model to support a complete specification or price ranking.
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| Comparison point | Seiko mechanical Speedtimer | Tissot PRX T137.427.11.011.01 |
|---|---|---|
| Reference scope | Seiko’s UK page names SRQ047, SRQ051, SRQ053 and SRQ055. | One specific reference: T137.427.11.011.01. |
| Movement | 8R48 family; Seiko describes the 8R series as using a vertical clutch and column wheel. | Automatic Valjoux A05.H31, according to Tissot’s US product page. |
| Case diameter | Not stated on the cited Seiko page for the individual references; check the exact model listing. | 42 mm, according to Tissot’s US product page. |
| Chronograph and date layout | Confirm the specific reference page for its layout. | Three chronograph registers and a date display, according to Tissot. |
| Power reserve | Not stated in the cited Seiko source. | 65 hours, according to Tissot’s current cited US product page. |
| Crystal and water resistance | Confirm the specific reference page. | Sapphire crystal and 100 m water resistance, according to Tissot’s current cited US product page. |
| Price and local availability | Check a current listing for the exact reference and region. | Check the current local listing; the cited page is US-specific. |
Seiko’s cited page is for the UK, while Tissot’s is for the US. Their listings therefore do not provide a like-for-like regional price or stock comparison. A price-focused buyer should compare current local prices for the exact models rather than infer that one is the cheaper choice from these pages.
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- You want an automatic chronograph: The PRX is a specific alternative with published movement and feature details. Compare it with the exact 8R48 Speedtimer reference you are considering.
- You want the Speedtimer’s design: The PRX is not established as a visual substitute. Look for an alternative whose case, dial, and tachymeter styling match your preference, and verify those details on its own product page.
- You want to spend less: No current matched-region prices are established here, so a cheaper option cannot be named responsibly. Compare live local listings, including the exact reference, seller, and availability.
- You are comparing specifications: Check diameter and thickness, register arrangement, crystal, water resistance, bracelet and case design, price, and stock for each exact reference. The sources cited here do not establish all of those values for every Speedtimer model.
Do not confuse collection launch figures with this reference’s specification
Tissot’s 2022 PRX collection launch material states a 60-hour power reserve, while the current US product page for reference T137.427.11.011.01 lists 65 hours. For this comparison, use the individual reference’s current specification rather than applying a collection-level launch figure across models. Tissot’s PRX collection launch material.
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