To guarantee absolutely reliable read-off by COSC instruments, all movements must be presented with a white working dial and a black seconds hand.
为确保瑞士官方天文台认证（COSC）的仪器能可靠地检视每个机芯，所有机芯必须配置白色表盘和黑色秒针。
The final quality control guarantees that the operational parameters of each movement comply with the requirements of the Swiss Official Chronometer Testing Institute (COSC).
最终质量检测可确保每一台机芯的运行参数完全符合瑞士官方天文台认证中心(COSC)的严苛要求。
The final quality control guarantees that the operational parameters of each movement comply with the requirements of the Swiss Official Chronometer Testing Institute (COSC).
最终质量检测可确保每一台机芯的运行参数完全符合瑞士官方天文台认证中心(COSC)的严苛要求。
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