Chinese repeater watches
A repeater is a watch containing a device whereby the current time is delivered on demand as an audible signal. This is achieved by a set of small hammers and gongs triggered by a button or slider. Specific tones denote different time intervals, which add up to the current time. The position of the hand train determines the sequence of tones.
A quarter-repeater tells the time to the nearest quarter-hour, using one tone to count out the hours, and another to count the quarters.
A minute-repeater adds an additional tone, or combination of two tones, to count the time in increments of hour, quarter and minute.
Current Chinese Repeaters
In 2006, the Sea-Gull ST9000 became the first Chinese-made quarter-repeater, with a limited production run of 50 pieces debuted at Basel International Watch Fair. That same year Sea-Gull completed the ST9100 minute-repeater prototype. This appears to be a substantially different design to the ST9000. In 2009 the ST9100 entered limited production. The ST9150 combines a minute-repeater and perpetual-calendar.
Beijing Watch Factory has successfully combined the functions of minute-repeater and tourbillon in their MRB-1, which was added to their catalogue in 2009. Orders are limited to a maximum 20 pieces.