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。
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。
To guarantee absolutely reliable read-off by COSC instruments, all movements must be presented with a white working dial and a black seconds hand.
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