Seiko Prospex Monster SRPD25 vs Seiko Prospex Solar Tuna SNE575

Both are dive watches in the mid tier. In short: the Seiko Prospex Monster SRPD25 is mechanical (automatic) for the enthusiast feel and no battery; the Seiko Prospex Solar Tuna SNE575 is solar / light-powered for accuracy and low maintenance. The Seiko Prospex Monster SRPD25 is automatic, 200m water resistance, 42mm, hardlex crystal; the Seiko Prospex Solar Tuna SNE575 is solar / light-powered, 200m water resistance, 47mm, hardlex crystal.

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

Spec	Seiko Prospex Monster SRPD25	Seiko Prospex Solar Tuna SNE575
Movement	Automatic	Solar / light-powered
Water resistance	200m	200m
Case size	42mm	47mm
Crystal	hardlex	hardlex
Style	Dive	Dive
Price tier	Mid	Mid

Which should you buy?

The Seiko Prospex Monster SRPD25 is mechanical (automatic) for the enthusiast feel and no battery; the Seiko Prospex Solar Tuna SNE575 is solar / light-powered for accuracy and low maintenance
The Seiko Prospex Monster SRPD25 wears 42mm vs the Seiko Prospex Solar Tuna SNE575's 47mm — choose by wrist size

Where to buy

Seiko Prospex Monster SRPD25See price on AmazonCheck price

Seiko Prospex Solar Tuna SNE575See price on AmazonCheck price

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FAQ

What's the difference between the Seiko Prospex Monster SRPD25 and the Seiko Prospex Solar Tuna SNE575?
Both are dive watches in the mid tier. The Seiko Prospex Monster SRPD25 is automatic, 200m water resistance, 42mm, hardlex crystal; the Seiko Prospex Solar Tuna SNE575 is solar / light-powered, 200m water resistance, 47mm, hardlex crystal.

Which is better value, the Seiko Prospex Monster SRPD25 or the Seiko Prospex Solar Tuna SNE575?
Both sit in the mid tier, so it comes down to movement, water resistance and case size — see the spec table above.

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

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