Although there are many brands currently which produces minute repeater wristwatches, some has quarter repeaters, some have more complicated mechanisms, such as Grand Sonnerie, Petit Sonnerie.
Some brands will use a traditional slide to activate the gong, others will have a button to press. Different brands will pack different functions inside that one wristwatch, either a tourbillon movement, a perpetual calendar. Even some will go the extreme of split second chronograph.
As for the gongs, some has the tradition two gongs, others has three, Cathedral gong, Westmister chime etc, etc, etc.
How does one "rate" a mintue repeater ?? By the sound of the gong ?? By the most functions packed in one time piece ??
How does one "rate" the gong sound itself ??
How does this sound be determined to have pass the test before leaving the factory ??
Are there certain criteria in the watch manufactoring industry which Minute Repeater Watches must have ??
Great appreciated to all who can share some light regarding this type of mechanism.