From
http://www.minus4plus6.com/caseback.htm
After purchasing the 16710, I had the watch pressure tested at the Beverly Hills RSC. Upon inspecting the original caseback, one can see the watchmakers inscriptions indicating when and where the watch was opened.
The inscription reads as follows:
RBH 5/07 3/008 7380
The RBH (Rolex Beverly Hills) makes sense, as does the 5/07 (date). The other numbers are greek to me.
Watchmakers inscriptions on the caseback is a long held tradition that even Rolex follows.
-Sheldon