My other blue Rolex, an all-gen. but movement build, put together from parts that have been sitting in my drawer for more then 10 years, and now completed with a VR3135 movement which takes all gen.parts without modification. Very interesting to see in this magnification: the burned areas around the hour dots caused by the radiation of the tritium over approx. 40 years. Unrecognizable when on the wrist, but a very special effect created by time and radiation,and proof of authenticity which no replica can imitate.