An escapement mechanism for a timepiece movement or timepiece including at least one balance and at least one escape wheel. A transmission of impulses between the balance and the escape wheel is achieved by a single-piece flexible mechanism including at least one feeler spindle cooperating with the escape wheel or, respectively, with the balance, and the single-piece, flexible mechanism is connected by at least one flexible blade to a fixed structure of the timepiece, or respectively to the escape wheel.