B.R.M. Watch Boat Master Chronograph Blue Sun BM6-44-SA-N-CBL-AGR-OBLM. One of the distinctive features of this collection is the presence of a blue sun dial on each of the models. This dial, with shades of blue reminiscent of the movement of the waves, is adorned with bright rays similar to those of the sun. It provides a sense of depth and movement, as well as a touch of elegance to the watchs collection B.R.M Boat Master.