Casio Edifice EFV-540 vs Seiko Prospex Speedtimer Solar SSC813

Both are chronograph watches. In short: the Seiko Prospex Speedtimer Solar SSC813 has a sapphire crystal — more scratch-resistant for daily wear. The Casio Edifice EFV-540 is quartz, 100m water resistance, 44mm, mineral crystal; the Seiko Prospex Speedtimer Solar SSC813 is solar / light-powered, 100m water resistance, 39mm, sapphire crystal.

Last verified 2026-06-27 · specs from manufacturer data · tier = price band, confirm the live price at the retailer

Spec	Casio Edifice EFV-540	Seiko Prospex Speedtimer Solar SSC813
Movement	Quartz	Solar / light-powered
Water resistance	100m	100m
Case size	44mm	39mm
Crystal	mineral	sapphire
Style	Chronograph	Chronograph
Price tier	Entry	Mid

Which should you buy?

Their movements differ — Casio Edifice EFV-540: quartz, Seiko Prospex Speedtimer Solar SSC813: solar / light-powered
The Seiko Prospex Speedtimer Solar SSC813 has a sapphire crystal — more scratch-resistant for daily wear
The Casio Edifice EFV-540 wears 44mm vs the Seiko Prospex Speedtimer Solar SSC813's 39mm — choose by wrist size
The Casio Edifice EFV-540 sits in the lower price tier (Entry) if budget leads

Where to buy

Casio Edifice EFV-540See price on AmazonCheck price

Seiko Prospex Speedtimer Solar SSC813See price on AmazonCheck price

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FAQ

What's the difference between the Casio Edifice EFV-540 and the Seiko Prospex Speedtimer Solar SSC813?
Both are chronograph watches. The Casio Edifice EFV-540 is quartz, 100m water resistance, 44mm, mineral crystal; the Seiko Prospex Speedtimer Solar SSC813 is solar / light-powered, 100m water resistance, 39mm, sapphire crystal.

Which is better value, the Casio Edifice EFV-540 or the Seiko Prospex Speedtimer Solar SSC813?
The Casio Edifice EFV-540 is the lower-priced tier; the other steps up in build for more money — confirm both live prices at the retailer.

Citing these specs? Go ahead — manufacturer data, last verified 2026-06-27. Copy a ready-made reference:

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