If “Seiko’s affordable vintage-style chronograph” means the Prospex Speedtimer SSC813, the choice comes down to heritage and a classic chronograph layout versus the Casio Edifice EFS-S660PB-1A’s specified 1/20-second stopwatch and 100-meter water resistance. The title does not identify a Seiko reference, so SSC813 is an informed interpretation, not a confirmed match. Both watches are solar-powered; the available official information does not support a like-for-like global price verdict.
Which watches are being compared?
Seiko’s official Speedtimer family page describes its solar chronographs as drawing on the designs and styles of the brand’s 1960s and 1970s Speedtimer series. The SSC813 is a plausible interpretation of the title’s vintage-style Seiko: Seiko lists it with a 39 mm case and solar Caliber V192. The Casio representative is the EFS-S660PB-1A, a specific Edifice solar chronograph listed by Casio India. These are model-specific examples, not a comparison of every Speedtimer or Edifice variant. Check local listings for the exact reference and specification in your market.
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Sources: Seiko Prospex Speedtimer family and Casio India EFS-S660PB-1A.
How do their designs and dimensions differ?
Seiko: a specific heritage claim
Seiko explicitly connects the Speedtimer solar chronographs to its 1960s–70s Speedtimer designs. The SSC813 pairs that stated lineage with a 39 mm case and curved sapphire glass. Whether its styling feels more convincingly vintage is subjective; the historical connection is the manufacturer’s description, not an independent assessment.
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Casio: motorsport cues, without a stated vintage lineage
Casio presents the EFS-S660PB-1A as motorsport-inspired. Its case dimensions are 45.3 × 38.3 × 11.6 mm (length × width × height). Casio reports the width, while Seiko reports the SSC813’s diameter, so the figures are not directly interchangeable. The Casio’s 38.3 mm width alone does not establish that it wears smaller; wrist fit also depends on case shape and proportions.
What do the chronograph and solar functions offer?
| Feature | Seiko Prospex Speedtimer SSC813 | Casio Edifice EFS-S660PB-1A |
|---|---|---|
| Power | Solar, Caliber V192 | Solar powered |
| Stopwatch | 60-minute chronograph | 1/20-second stopwatch; elapsed-time, split-time, and first- and second-place timing |
| Additional indication | 24-hour sub-dial and power-reserve indication shown on demand, as described on Seiko’s family page | Not stated in the cited Casio product information |
| Approximate runtime | Not stated in the cited Seiko information | About five months from a full charge until the hands stop; approximate, not a guarantee for every use or lighting pattern |
The specifications point to different priorities. Seiko gives the SSC813 a conventional 60-minute chronograph, while Casio emphasizes fine stopwatch timing. Casio describes the center chronograph seconds hand as delivering its 1/20-second measurement and says the bezel tachymeter can help calculate average speed. These are manufacturer descriptions of the functions, not independent timing tests.
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What are the crystal and water-resistance specifications?
| Specification | Seiko SSC813 | Casio EFS-S660PB-1A |
|---|---|---|
| Crystal | Curved sapphire glass | Sapphire crystal with glare-resistant coating |
| Water resistance | Not stated in the cited Seiko source | 100 meters, according to Casio India |
The cited Seiko page does not establish a water-resistance rating, so it cannot support a claim that the two are equivalent for water use. Consult the exact watch’s regional specification and instructions before choosing it for swimming or other water activities.
How should you compare their prices?
Casio India lists the EFS-S660PB-1A at an MRP of ₹16,995, including taxes. That is a market-specific Indian list price, not a global price or necessarily the price a buyer will pay. The cited Seiko source does not provide a current SSC813 price, so the available figures cannot establish which watch costs less or whether the Seiko is worth a particular premium. Compare current local prices for the exact references before deciding.
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Which one should you choose?
- Choose the SSC813 if Seiko’s stated 1960s–70s design heritage, its 39 mm stated diameter, curved sapphire, and 60-minute chronograph are the features you value most.
- Choose the EFS-S660PB-1A if you want Casio’s specified 1/20-second stopwatch functions, 100-meter water resistance, glare-resistant sapphire, and an India-listed price to use as a local reference.
- Try the case on if possible if fit is the deciding factor. The manufacturers state dimensions differently, and specifications alone do not establish how either case will look or feel on your wrist.
These recommendations follow manufacturer-published specifications; there has been no side-by-side wearing, accuracy, comfort, or durability test establishing an overall winner.
Quick Recap
Best Value
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