Officine Panerai Luminor Power Reserve PAM 00090.

Power Reserve. One of the most useful features that a mechanical watch can have in order to ensure accurate timekeeping is a power reserve indicator. A power reserve indicator works like a fuel gauge, showing the length of time a watch will continue to run. A watch should have at least 20% of its mainspring wound for the watch to run at a regular rate.

The typical owner of a automatic watch simply picks it up, shakes it a few times to get it started and wears it. This practice means that it is not actually keeping accurate time for the first few hours of use. This is why people are advised when using a automatic watch that has completely unwound its mainspring to manually wind the crown about 20 times. In an automatic watch worn for 10 to 12 hours daily, it will wind its mainspring sufficiently to continue telling accurate time. In one worn less frequently, it is a good gauge in telling you how if you should manually wind the watch.

In a manually wound watch a power reserve indicator is a good tool inform you as to when it is time to wind a manual winding watch in order to keep it running accurately.

Officine Panerai Luminor Marina PAM 00090. The Luminor Marina PAM 90 is one of the watches in Panerai as a contemporary line-up. It displays the date at the 3 o'clock position under a magnified sapphire crystal glass and a power reserve indicator at the 4 o'clock position.

The watch is powered a highly accurate self-winding Panerai OP III Calibre movement. The Panerai OP IX Calibre is a Panerai modified Valjoux 7750 movement. This movement produces 28,800 semi-oscillations per hour (4 Hz) and is certified as a chronometer by the Contrôle Officiel Suisse des Chronomètres Certified Chronometer. The movement has a 42 hour power reserve.

The PAM 90 is water resistant up to 300 meters and is protected by the Incabloc anti shock device. The clamp which protects the winding mechanism is what gives the PAM 104 and other Luminors their distinctive look. This locking lever was first used in the early 1940's gave the Luminor's than a unprecedented water resistance of 200 meters. The locking lever was patented in Italy in 1956, and Panerai was able to obtain a U.S. Patent in 1960.

About Panerai. Officine Panerai was founded in 1860 in Florence, Italy by Giovani Panerai. Panerai was acquired over by Swiss watchmaker Richemont S. A. in 1997.