All Hydrocarbon watches use two screws per side to secure the end link. The big news is that they appear to have gone away from the previous slotted screws that are easy to slip off of to the Torx which are far more positive. These were used on the limited edition Orbital also last year. This is a mono block case so it is quite different from previous Hydrocarbon watches. One other big improvement to note for those of us with hairy arms is this bezel does not have the hair pulling tabs over the indexes like previous Hydrocarbons. Movement is a 2892 COSC.
I have to go look and see what I have with regards the dual marking on the Bezel. I seem to remember someone naming a few divers from the past that had the same setup.