[WTS/WTT] Rolex Daytona Zenith-era Black dial, U serial 1999 full set! Ref. 16523

Up for sale here is the lowest entry into the Daytona market. This is the Zenith era Daytona- back when Rolex used to buy the El Primero base movements and use them in the Daytona! Ref. 16523. Of course, Rolex modified the El Primero movements heavily before calling them their own, and branding it as the 4030 movement. They removed the date function to make it slimmer, switched the balance wheel and pallet assembly so that it operated at 4hz instead of 5hz, and actually only left about half the...