Escape wheel (1) including a toothed impulse wheel (2) and a toothed release wheel (4) pivoting synchronously about an axis (D1). The toothed release wheel (4) includes moveable gears (5) each with a release tooth (6), radially moveable relative to the axis (D1) and returned to a position of balance by first return device (7), and a locking tooth (8), returned in a first radial direction (S1) towards a stop member by second return device (9). The impulse tooth (6) includes drive device (11) arranged to cooperate, when the impulse tooth moves in a second opposite radial direction (S2), with complementary drive device (12) of the locking tooth (8) for driving the locking tooth in the second direction (S2) and, when the impulse tooth moves in the first direction (S1), to remain at a distance from the complementary drive device (12) without driving the locking tooth (8).