Omega Seamaster Aqua Terra Chronom 2005 2009 2104 2304 2504 2505 2509 2604 TPD & Winder Settings | Aevitas

Owners of the Omega Seamaster Aqua Terra Chronom 2005 2009 2104 2304 2504 2505 2509 2604 often ask us which winder programme this movement actually needs. The answer is 650 turns per day on a bidirectional cycle — the figures are set out below.

Recommended Winder Settings

Setting	Value
Turns per day (TPD)	650
Winding direction	bidirectional
Movement

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Why These Settings Matter

Every automatic movement is designed to receive a certain amount of winding each day. Give the Seamaster Aqua Terra Chronom 2005 2009 2104 2304 2504 2505 2509 2604 its 650 turns and the mainspring stays in the middle of its power band, where timekeeping is most consistent. Drop well below that figure and the watch gradually runs down; the date and time then need resetting by hand.

There is no need to worry about going over the top: like all modern automatics, this movement has a slipping mainspring bridle that lets the barrel slip once it is fully wound, so extra turns cannot overwind or damage it. A higher setting simply means the winder cycles a little more often than strictly necessary.

Every Aevitas winder can be programmed from 650 to 1,850 TPD in either direction, so matching the 650 TPD this watch needs takes seconds.

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