Device for measuring the accuracy of a mechanical watch

A device for measuring accuracy of a mechanical watch, wherein the measuring device comprises:

• a time reference source, formed by an internal time reference source, or by a receiving and processing device to receive and process signals transmitted by an external time source to permanently update a repeater clock internal to said measuring device;
• a device to shoot at least one of photographs and video, said device to shoot at least one of photographs and video being coupled to said time reference source;
• a storage device to store images resulting from at least one of shots and display values corresponding to said images, and time reference points of instants at which said shots are taken, said time reference points being supplied by said time reference source;
• at least one of image analysis hardware and image analysis software to determine at least one of a position in space of visible indicators in each shot taken, and a time display value in each shot taken;
• a calculating device to calculate at least one of time differences between the display values provided by said at least one of image analysis hardware and image analysis software and time differences between the time reference points provided by said time reference source, and to calculate a variation in rate;
• and
• at least one of another data processing unit to store and process at least one variation in the rate calculated by said calculating device, and a viewing device to display at least one variation in the rate calculated by said calculating device.