Prospex Sumo Watch Winder Settings | Tempus

Seiko's much-loved mid-range dive watch with 70-hour reserve. The Seiko Prospex Sumo is an automatic watch, so a quality watch winder keeps the mainspring topped up while you are not wearing it.

Getting the settings right matters for accuracy and convenience. Here are the turns-per-day and winding direction we recommend for the Prospex Sumo, plus Tempus models that handle them effortlessly.

Recommended Winder Settings

Setting	Value
Turns per day (TPD)	650–800
Winding direction	Bidirectional
Movement	Calibre 6R35
Reference	SPB103

Note: sources cite a small range for this movement. Start at the lower figure — if the watch is not holding its reserve, step up within the range.

Setting Up Your Tempus Winder

Select 650–800 TPD and bidirectional rotation on the winder's control panel — on touch-screen Tempus models this takes seconds. Place the Prospex Sumo on the holder, close the lid, and let it run. Check after 48 hours: if the watch is running accurately and holding its reserve, the setting is right. Tempus winders run whisper-quiet, so a bedroom or study placement works well.

Tempus Winders for the Prospex Sumo

Any Tempus winder with programmable TPD will handle these settings. Three solid picks:

Tempus 6 Biometric (£1,121) — programmable TPD, bidirectional mode supported, 3-year warranty included.
Tempus 9 Touch Screen (£1,121) — programmable TPD, bidirectional mode supported, 3-year warranty included.
Tempus 12 Biometric (£2,096) — programmable TPD, bidirectional mode supported, 3-year warranty included.

Frequently Asked Questions

What TPD does the Seiko Prospex Sumo need?

The recommended setting is 650–800 turns per day, bidirectional. Most Tempus winders cover this range with programmable TPD steps.

Which winding direction for the Prospex Sumo?

Bidirectional rotation. Tempus winders offer clockwise, counter-clockwise and bidirectional modes, so this is covered.

Can I leave my Prospex Sumo on a winder all the time?

Yes. Modern automatic movements have a slipping mainspring that prevents overwinding, so continuous gentle rotation is safe. An incorrect TPD setting will not damage the watch — at worst it simply will not stay fully wound.

Does Tempus offer a warranty on winders?

Every Tempus watch winder carries a 3-year warranty, and Tempus can repair any Tempus-brand winder even once the warranty has expired.

Looking for another model? Browse the full Tempus TPD settings guide.

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