Which is better for swimming?

The Promaster. It is rated 20 bar (200m); the AQ4091-56M is rated 10 bar (100m) and is a dress watch.

Which keeps better time?

The AQ4091-56M. Its A060 movement is rated ±5 sec/year, while the Promaster uses standard Eco-Drive quartz, roughly ±15 sec/month.

Is the AQ4091-56M worth the extra money?

Only if you value titanium, sapphire and near-annual accuracy in a dress watch. At $2,378.97 versus $220.00 as of November 7, 2026, the Promaster covers far more daily use per dollar.

Both run on light with no battery to replace. The AQ4091-56M's sapphire and titanium resist wear better; the Promaster's mineral crystal and rubber strap show age sooner.

Do either need a battery change?

No. Both use Citizen Eco-Drive solar movements charged by any light source.

Which is better for travel?

The Promaster, because of its dual time function and 200m rating. The AQ4091-56M has no second time zone and no radio sync.

Citizen Eco-Drive AQ4091-56M vs Citizen Eco-Drive Promaster

These are not really rivals. The AQ4091-56M is a titanium dress watch with a ±5 sec/year movement and sapphire crystal, priced at $2,378.97 at eBay as of November 7, 2026. The Promaster BJ7004-43H is a 200m steel-and-rubber sports watch at $220.00 at eBay as of November 7, 2026. Buy the Citizen if you want a light, precise dress piece and the Promaster if you want a rugged everyday beater for a tenth of the price.

Today the Citizen Eco-Drive Promaster costs $2,158.97 less at its best price.

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