Rolex Caliber 7135: new indirect impulse escapement and high frequency movement

In practice, the lever escapement is king. If you own a mechanical watch, there is a very high probability it utilizes the lever, from Seiko 5s to every prior Rolex ever made. The Crown introduced a proprietary lever escapement in 2015 — the Chronergy escapement. Even with ultra-optimized geometry like in the Chronergy system, any lever escapement has a few fundamental flaws. The most significant of which is the lever's inherent friction and, therefore, need for lubrication. Just by glancing at the lever escapement in action, the friction between the escape wheel teeth and ruby pallets is quite evident. The teeth are scraping along the jewels. At 28,800 vph (4 Hz), this collision happens eight times per second or 252,288,000 times per year. Oil is used to combat this friction, and this is the reason you need your watch serviced every few years. ... Read full article.