IWC GST Titanium Chronograph 3707 003
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The Fish on the Crown
stands for water resistance. To my knowledge, that symbol is not actually standardized, but it is used by several Swiss watch manufacturers. The GST Chronograph features a screw down crown and its pushers are a real pleasure to use. IWC enhances the Vajoux 7750 calibers in many ways, please follow this link for additional information.