Armin Strom PURE RESONANCE, Owner'S Manual

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When fully wound, the watch has a 48h
power-reserve. The two barrels of the
Pure Resonance model are fitted with a
slip-spring, which is not locked when the
movement is fully wound. Some thirty
turns are needed to wind the watch fully.
You may also check the state of winding
by looking on the back of your watch at the
two barrel springs compressed around
their arbor once the movement has been
fully wound.