20 Most Recent Rolex Daytona 116520 Wrist Watch - Page 6 Questions & Answers

This is very difficult to say if your watch is genuine or fake just by the numbers given, but if you will pop in to any decent watch repair shop, they will be able to tell you within a matter of few minutes.

If your rolex has a serial number inside the case on back of the works it is real. only rolex watches have this kind of number

its a custom made double handed tool with a milled edge cut out to mesh with the case back to use anything else will mark and damage the watch and to open the back will interfere with its water resistance unless pressure tested again

Sounds like mainspring is not holding in place and getting undone (unrolls by itself), that what usually causes the vibration.
W-Precision

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