My 16710 coke is a P serial number - circa 2001 and the papers say do say 16710A. However, as noted already one can easily source the other bezel inserts and have all three (coke, pepsi & black). 16710 is the watch model reference # and, regardless of the bezel insert color, that doesn't change .
Also, a great reference site for GMT owners is this one:
www.gmtmasterhistory.com. I don't think I am breaking any forum rules for noting this as I recall seeing that site referenced in others posts.