It is also driven by a small wheel for less inertia. Silicon was used because it is 3.5x lighter than a tradtional wheel, and since this one is continually running, it would cause less wear on the movement. Zenith's beautifully finished caliber 4052 B can be seen through a sapphire caseback The blue double-layered clutch wheel, which can be seen at the top in the picture above, is made completely of silicon and runs both the continually running seconds register and sweeping hand. I found myself timing everything to a 1/10th of a second, just because I could. Essentially, the sweeping hand here moves at 6x the pace of a normal chornograph's hand, and thanks to the clearly marked flange on the rim of the dial and a chronograph clutch-wheel that is perpetually engaged (even when the chrono is not running), stopping the 1/10th second hand and reading it precisely is incredibly easy. The idea behind this watch is to have a center seconds hand that rotates around the dial not once every 60 seconds, but once every ten seconds, allowing the reader to measure 1/10th of a second accuracy with ease. These 11 new components allow the El Primero, which has had a frequency of 36,000 vibrations per hour since its launch over forty years ago, to take full advantage of this incredibly high frequency (FYI - when Rolex used the El Primero movement in its Daytona, they modified it to beat at a slower 28,000 vph). And, inside is not your standard El Primero - it's your standard El Primero plus 11 new components. This El Primero isn't about tracking hours, it's about tracking a fraction of a second. Here, you'll see that there exists no hours register, and that is because the Striking Tenth does not account of hours at all with its chronograph function. The Striking Tenth's Sub-Dial Layout Is Different Than Other El Primeros To Accommodate The Innovative Movement 40 Years + 11 Components
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