The open dial was an incredibly successful execution and endlessly influential. Nataf correctly grasped that the core attraction of a mechanical watch lies in the beating heart. He brought it to the fore and compounded the decision with skeletonized bridges to amplify the visibility. Consider how many brands have emulated this design masterstroke. 90% of the appeal of a tourbillon at 10% of the cost.
656 Zenith listings are live on the eBay market and 164 collector listings on the WatchProSite marketplace.