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Seiko Prospex Speedtimer Mechanical SPB513
The Seiko Prospex Speedtimer Mechanical SPB513 (SPB513J1) is an everyday sports watch from Seiko: a 39.5 mm stainless steel case, 12 mm thick and 44.5 mm lug to lug, with an automatic 6R55 movement and 200 m water resistance.
Going by its 44.5 mm lug to lug, it should sit within the flat top of a wrist of about 6.0 inches (15.3 cm) or larger.
Research found it at $995 list in the US (checked August 2026).
I like the case, the finishing and the Speedtimer history, and it's good for 200 m. Despite the name it isn't a chronograph, because the second crown turns a countdown ring, so the movement and the price need a hard look.
Specifications
From the research, with the sources for each group of facts. Unknown means no source confirmed it.
| The watch [1][2][3] | |
|---|---|
| Brand | Seiko |
| Reference | SPB513J1 |
| Category | Everyday / Sport |
| Production | Current (introduced 2025) |
| Case and size [1][2][4] | |
| Case diameter | 39.5 mm |
| Lug to lug | 44.5 mm |
| Thickness | 12 mm |
| Lug width | 20 mm |
| Case material | Stainless steel (super-hard coating) |
| Crystal | Curved sapphire crystal, anti-reflective coating on inner surface |
| Water resistance | 200 m (20 bar) |
| Weight | 154 g |
| Movement [1][2] | |
| Movement | 6R55, automatic |
| Power reserve | Approx. 72 hours (3 days) |
| Accuracy | +25 to -15 seconds per day (official spec); one Monochrome reader reports ~+7 s/day observed (anecdotal) |
| Bracelet [2][4][1] | |
| Bracelet or strap | Stainless steel multi-row '70s-style bracelet; Jubilee-inspired three-piece links: broad brushed center piece flanked by two narrower polished pieces… |
| Clasp | Three-fold clasp with push button release |
| Price and warranty (US) [1][2][4][3] | |
| List price (US) | $995 (official US site, accessed 2026-08-26) |
| Street price (US) | Unknown |
| Used price (US) | Unknown |
| Warranty | Unknown |
Will it fit?
A watch wears comfortably when its lugs stay on the flat top of the wrist. Here is the 44.5 mm lug to lug against the flat top estimated for common wrist sizes.
| Wrist | Flat top | Fit |
|---|---|---|
| 6 in 15.2 cm | 47 mm | At the edge |
| 6.5 in 16.5 cm | 51 mm | Comfortable |
| 7 in 17.8 cm | 55 mm | Comfortable |
| 7.5 in 19.1 cm | 59 mm | Comfortable |
| 8 in 20.3 cm | 63 mm | Comfortable |
Check it against your own wrist An estimate, not a guarantee; how the method works is on the tool page.
What the research found
These are the research’s judgments, scored against Holden’s priorities, not his own words.
Strengths
- Compact 39.5 x 12.0 x 44.5 mm proportions rare in the racing-sports category
- Faceted mixed finishing and super-hard coating at sub-$1,000
- Genuine 1972 Speedtimer design lineage with its own identity
- 200 m water resistance and 4,800 A/m on a sports-casual watch
- 72 h power reserve with hacking and hand winding
Weaknesses
- 6R55 is a basic low-beat time-and-date movement with a loose +25/-15 s/day spec at a $995 price
- Anecdotal reports of the 4 o'clock crown rotating the countdown bezel from wrist contact
- Clasp is a simple three-fold with no verified micro-adjustment
- The Speedtimer name implies a chronograph the watch does not have
Research scores, 0 to 10
| Execution and feel in the hand | 7.8 |
|---|---|
| Design identity | 8.3 |
| Value at a realistic price | 6.4 |
| Long-term ownership | 8.0 |
| Movement and engineering | 5.8 |
| Wearability and proportions | 8.8 |
| Versatility and durability | 8.0 |
| Fit with Holden's collection | 7.3 |
Also on Holden’s list
Other everyday / sport watches on his list.
Sources
- Seiko SPB513J1 — official product page seikowatches.com · read August 26, 2026
- First Look: Seiko Prospex Speedtimer SPB513 & SPB515 monochrome-watches.com · read August 26, 2026
- Seiko Prospex Speedtimer Mechanical — official special page seikowatches.com · read August 26, 2026
- Seiko SPB513 Prospex Speedtimer Mechanical | Hands On timeandtidewatches.com · read August 26, 2026
Personal research, not a source of truth. Spotted an error? Email a correction.