The Accutron 2210

This, in my humble opinion, is the most interesting of all the tuning fork watches. It is the smallest tuning fork model ever made, and was mainly used in ladies watches. Note the curved tines of the tuning fork. This is to allow room in the center of the watch for the battery. The electronics had been reduced in size as current technology allowed, in this case the coils were controlled by a hybrid integrated circuit. Another unique feature of this model is the gear train. They had only a very limited amount of room, and so used worm gears on two of the reductions to achieve the required ratios. Other interesting features are that the hands do not need to be removed from the watch before the dial is taken off, and if the crown is pulled out, as for setting, the watch consumes only 1/3 normal power, so it can be stored like this. It was never offered with a sweep second hand, as the mechanical arrangement would not allow for easy adaption to this. This is an interesting one to own if you are a musician, as the fork is tuned to exactly A=440Hz, standard concert pitch. I wonder if this was deliberate.