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The serial numbers on the back of a watch are there for the customer to know that the watch is real. The serial numbers can be looked up at the retailers.
Numbers on a coin usually signify the year it was minted.
MOCCLXXVI are roman numbers, in Arabic numbers it's 666
They usually refer to things such as the date of manufacture, the make and model and the individual watch.
The "mean" of a group of numbers is their "average". It doesn't tell you what the numbers are, or even how many numbers there are.