The wristwatch (1) comprises: - at least one containing case (2) having a through hole (3); - at least one mechanism contained in said case (2) and associated with time marking hands able to signal the time to a user; - at least one adjusting member (4, 8) at least partially fitted in said through hole (3) and associated with said mechanism for the manual adjustment of the mechanism itself and comprising: - at least an adjusting crown (4); and - connecting means (8) at least partially fitted in said through hole (3), able to connect the crown (4) to the mechanism for the adjustment of the latter. The crown (4) is entirely made of polymeric material.