I own 3051 BO also.
Very nice watch, swiss movement. Superb lume.
But a few days ago I go to look some new luminox. Mine 3051 had stamped number "52" same as the warranty card. I found in that shop, same model without stamped any number 52 or 65. It is a identify number for that watch.
The salesman hardly explain to me the one that not stamped any number. I could notice the none stamped watches has a lose crown. Make me think twice to buy the new one. I'm planning to buy 3053
Anyone here experiencing this before?