That is an early quartz Omega model. The button on the edge of the case is used to reset the time. A laborious task on these models. That, plus these were produced by the original Omega company, not Swatch/Omega, so it is likely 40 years old, or older. To the best of my knowledge, they are not repairable because of lack of parts! Look for other opinions, but I’d say you should avoid this model.