Buy & Review Rolex Oyster Perpetual Submariner Date Two-Tone Steel Mens Watch 16613BK
Product Description
Two-tone stainless steel case and oyster bracelet. Black dial and black bezel. Special time-lapse bezel. Pressure proof to 1000 feet. 31 jewel chronograph movement. Synthetic sapphire crystal. Double Locking Deployment clasp and extension link. Date displays at 3 o'clock position. Case diameter 40mm. Rolex Model Number 16613.
Product Details
- ASIN: B000KL73FE
- Average Customer Review:
- Amazon.com Sales Rank: #33,843 in Watches
Beautiful watch that keeps great time.,
February 12, 2008 I am always bewildered by the occassional statements of Rolex owners that complain of their watch's inaccuracy. For Rolex and other great Swiss watches that have certified movements, the certification is from Contrôle Officiel Suisse des Chronomètres (COSC), the Official Swiss Chronometer Testing Institute, which is the institute responsible for certifying the accuracy and precision of wristwatches in Switzerland. The standard for COSC as a chronometer is -5/+6 seconds per day. This figure will be consistent wheather it is fast or slow. Any Rolex owner with a COSC certified chronograph movement, that isn't keeping time within standards, simply needs to have it timed by a Rolex technician. I have a submariner that has been a nearly daily wear watch for 20 years. It has been within COSC specs, +1 second per day, for 20 years. I remember when I bought it new, the Rolex technician explained the mechanism to me and said it is nearly impossible to make a watch run at 0, and since nobody wants a watch to run slow, it is safer to time the watch for 1 second fast.
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