Device for the connection and separation of a watch case with a watchband

Watch case (2) comprises at least two horns (7), at least one of the horns having, on a side face (8, 9), an orifice (13) and a ramp (12). The ramp is inclined so that, when one end of a pump (6) of a watch strap traverses the ramp towards the while being supported on the other horn aperture, the ramp causes compression of the pump.