Watch, in particular a wristwatch, comprising: - an electro-optical transducer device with at least one electro-optical transducer (10; 11, 12), - an optoelectrical transducer device, - a first signal path, which leads via a first optical waveguide into the optoelectrical transducer device, - a second signal path, which leads directly or via a second optical waveguide into the optoelectrical transducer device, - a control device, and - a useful signal generating device, wherein: - the electro-optical transducer device is configured to feed a first clocked light signal into the first optical waveguide and a second clocked light signal into the second signal path, - the optoelectrical transducer device is configured to generate a first electrical signal based on the first clocked light signal and a second electrical signal based on the second clocked light signal, - the first signal path and the second signal path are configured in such a way that a travel time of the first clocked light signal in the first signal path and a travel time of the second clocked light signal in the second signal path are different from one another, - the control device is configured to generate a control signal based on a phase difference between the first electrical signal and the second electrical signal, and to control the electro-optical transducer device for generating the two light signals by means of the control signal, - the useful signal generating device is configured to generate a useful signal clocking the time based on a frequency of the control signal, and - the watch comprises a watch display device for displaying the time based on the useful signal. - an electro-optical transducer device with at least one electro-optical transducer (10; 11, 12), - an optoelectrical transducer device, - a first signal path, which leads via a first optical waveguide into the optoelectrical transducer device, - a second signal path, which leads directly or via a second optical waveguide into the optoelectrical transducer device, - a control device, and - a useful signal generating device, - the electro-optical transducer device is configured to feed a first clocked light signal into the first optical waveguide and a second clocked light signal into the second signal path, - the optoelectrical transducer device is configured to generate a first electrical signal based on the first clocked light signal and a second electrical signal based on the second clocked light signal, - the first signal path and the second signal path are configured in such a way that a travel time of the first clocked light signal in the first signal path and a travel time of the second clocked light signal in the second signal path are different from one another, - the control device is configured to generate a control signal based on a phase difference between the first electrical signal and the second electrical signal, and to control the electro-optical transducer device for generating the two light signals by means of the control signal, - the useful signal generating device is configured to generate a useful signal clocking the time based on a frequency of the control signal, and - the watch comprises a watch display device for displaying the time based on the useful signal.