1961 Rolex Oyster Royal 6427 - Stainless Steel Engine Turned Bezel Santos The 18K yellow gold case

The 18K yellow gold case and integrated bracelet show signs of wear consistent with a watch from this era

showing honest wear consistent with a watch from this period

Furthermore

This watch is defined by its exceptional configuration

Here's a vintage Chopard Geneve moon phase Daydate in 18k yellow gold in quartz from the 1990s

1961 Rolex Oyster Royal 6427 - Stainless Steel Engine Turned Bezel Santos The 18K yellow gold caseThe Mid Century Oyster Foundation The reference 6427 represents a pure, unadorned expression of mid century design language, originating from an era when utilitarian durability and elegant simplicity coexisted seamlessly. Grouped within the historic Oyster Royal lineage, this 1961 example features the legendary water resistant Oyster case architecture in a tailored 34mm footprint. Long before the catalog expanded into highly specialized, task specific