Until we know more about Bell & Ross' Grand Complication tourbillion, this is my favorite BR01. The 46mm case houses an ETA 2892 movement behind anti-reflective sapphire crystal. Straps are available in leather, rubber, and fabric. Bell & Ross have been making military spec watches based on aviation instruments since 1992 in their Swiss based factory. They basically started out with rebranded Sinn's, but have truly come to their own - the proof is in the tourbillion.