Push button system and timepiece comprising the same

A push button system intended to activate an actuation member, the system comprising:

• a button head including a head housing and a hollow sleeve forming a bottom of the head housing;
• a pusher actuator fixed within the hollow sleeve, the pusher actuator having a lower end configured to cooperate with the actuation member;
• a first hollow guide member, the pusher actuator being mounted to slide into the first hollow guide member, the first hollow guide member being configured to be secured to a fixed element relative to the button head and to the pusher actuator;
• a second hollow guide member arranged in the button head;
• a pin mounted to slide into the second hollow guide member, and configured to be secured to the fixed element;
• wherein the pusher actuator has an upper portion provided on the periphery thereof with a collar configured to cooperate with an internal face of the first hollow guide member to guide the pusher inside said member,
• wherein the collar has a larger diameter than the diameter of the rest of the pusher actuator,
• wherein the first hollow guide member comprises an upper part adjusted to slide inside a head housing and radially outside of the hollow sleeve, and
• wherein the first hollow guide member comprises a lower part separated from the upper part by a first shoulder, an outer diameter of the upper part is larger than an outer diameter of the lower part, and an outer diameter of the first shoulder is larger than the outer diameter of the upper part.