[Vince M.]

Originally Posted by HarryFlashman

The “M” is a reference to the first letter of the serial number, as before Rolex moved to random serials the first letter generally correlated to a year (M was circa 2008).

Here is a great resource in the variations of the 16610LV:

https://www.watchclub.com/curated-by...ry-sub-decoded

Thanks for that !