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This suffix refers to the specific production series or manufacturing facility. While some collectors speculate it relates to shock or magnetic resistance, it is most commonly used by Citizen to identify the generation of the case design . Typical Features and Technology
Either way, you’ve stumbled upon one of the best-kept secrets in the vintage watch world: the citizen watch gn 4w s 12g
The "Citizen Watch GN 4W S 12G" isn't a headline grabber. It won't impress your friends who only know Rolex. But for the person who appreciates engineering, history, and value, it is a masterpiece. This suffix refers to the specific production series
Later Case Backs: The end of the 1960s saw the introduction of case numbers, distinct from the earlier combined model designation. Sweephand's Vintage Citizen Watch Blog What's does GN-4-S means on the CITIZEN back cover? It won't impress your friends who only know Rolex