20世纪70年代中期，他为SamClutton制作了一块双擒纵机构的表。32天里表的误差没有超过一秒。
In the mid-1970s he made a double-escapement watch for Mr Clutton which, over 32 days, lost less than a second.
20世纪70年代中期，他为SamClutton制作了一块双擒纵机构的表。32天里表的误差没有超过一秒。
In the mid-1970s he made a double-escapement watch for Mr Clutton which, over 32 days, lost less than a second.
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