Which is better for swimming and snorkeling?

The Promaster Sea. Its 200 m rating, screw-down crown and rotating bezel are built for dive use. The Chandler's 100 m is fine for surface swimming but not for diving.

Both use Eco-Drive and never need a battery change, so the movement life is similar. The Promaster Sea's screw-down crown and dive sealing hold up better to repeated water exposure; the Chandler's mineral crystal is the more likely part to scratch.

Is the Promaster Sea worth the extra $100?

Only if you dive or want the rotating bezel. At $259.00 versus $157.94, you pay for 200 m sealing, a screw-down crown and dive styling. For daily casual wear the Chandler covers it for less.

Which fits a small wrist?

The Chandler. Its 37 mm case and 54 g weight sit close to the wrist. The Promaster Sea's 44 mm case is noticeably larger and heavier.

Do either need battery changes?

No. Both are Citizen Eco-Drive, charged by any light. The Chandler's cell holds a charge for at least 8 months in the dark.

Which has more functions?

The Chandler adds a day window alongside the date. The Promaster Sea shows date only but adds a timing bezel.

Citizen Eco-Drive Chandler vs Citizen Promaster Sea Eco-Drive

Buy the Eco-Drive Chandler if you want a light, small field watch for everyday wear at the lowest price. Buy the Promaster Sea if you actually dive or swim hard and need 200 m water resistance, a rotating bezel and a screw-down crown. The Chandler's best new price is $157.94 at eBay as of November 5, 2026, against $259.00 at Amazon for the Promaster Sea. Both run on light and never need a battery change.

Today the Citizen Eco-Drive Chandler costs $95.10 less at its best price.

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