http://www.secondtimeround.com/cosmo...20history.html
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Rolex's latest addition to the Daytona hysteria was launched at the end of 2000. The 116520 which like the rest of Rolex's models has an extra 1 prefix to differentiate it from the others. There have been a few dial refinements but the main difference is the fact that Rolex are now using an in house movement instead of the old Zenith one.
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