Pre-owned Rolex GMT Master II 126710BLNR "Batgirl", full set. It presents the caliber 3285 movement, which uses the Chronergy escapement and is regulated to an incredible +2/-2 seconds per day, and it comes on the Jubilee bracelet with the Oysterlock clasp. It's worth noting that the old Batman and the GMT-Master II with an all black bezel have both been discontinued. If you want a steel GMT it now has to be either the BLNR or the BLRO on a Jubilee. What about the "Batgirl" nickname? The nickname itself came from the fact that the lugs on the Rolex 126710BLNR are a bit thinner and more curved than the ones found on the original Batman GMT-Master II, plus the Jubilee bracelet provides the watch with a slightly more refined and dressy overall aesthetic. Brand: Rolex Model: Gmt Master II Reference: 126710BLNR Case Material: Steel Movement: Automatic Dimension: 40 Mm Dial: Black Bezel: Ceramic Crystal: Sapphire Bracelet Type: Jubilee Bracelet Material: Steel Original Box: Yes Original Papers: Yes Year: 2015-17 Condition: Very Good