Seiko Prospex SPB143 vs Marathon TSAR
Both are dive watches in the upper tier — here's how the specs differ and which to pick.
| Spec | Seiko Prospex SPB143 | Marathon TSAR |
|---|---|---|
| Movement | Automatic | Quartz |
| Water resistance | 200m | 300m |
| Case size | 40.5mm | 41mm |
| Crystal | sapphire | sapphire |
| Style | Dive | Dive |
| Price tier | Upper | Upper |
Which should you buy?
- the Seiko Prospex SPB143 is mechanical (automatic) for the enthusiast feel and no battery; the Marathon TSAR is quartz for accuracy and low maintenance
- the Marathon TSAR takes more water (300m) — the one to pick if you actually swim or dive
Where to buy
Check the Seiko Prospex SPB143 price on Amazon →
Check the Marathon TSAR price on Amazon →
FAQ
What's the difference between the Seiko Prospex SPB143 and the Marathon TSAR?
Both are dive watches in the upper tier. The Seiko Prospex SPB143 is automatic, 200m water resistance, 40.5mm, sapphire crystal; the Marathon TSAR is quartz, 300m water resistance, 41mm, sapphire crystal.
Which has better water resistance, the Seiko Prospex SPB143 or the Marathon TSAR?
The Marathon TSAR, rated 300m, versus 200m on the other. Pick 100m or higher for swimming and 200m+ for diving.
Which is better value, the Seiko Prospex SPB143 or the Marathon TSAR?
Both sit in the upper tier, so it comes down to movement, water resistance and case size — see the spec table above.
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