Patent ID: 8272778

Claim:
A watch comprising: a case band member; a bezel member rotatably mounted to the case band member; one of the two members having an accommodating groove extending in the peripheral direction thereof over a range of at least approximately 180°, a pair of passing portions continuous with the accommodating groove at positions spaced apart by approximately 180° and open to the outer periphery of the one member, and a pair of escape grooves continuous with the passing portions from the center side of the one member and open to mating surfaces of the two members; the other of the two members having engagement grooves arranged in a ring-like fashion in the peripheral direction thereof so as to be opposed to the accommodating groove, and a ring-shaped reception groove surrounded by the engagement grooves and continuous with the engagement grooves; and a lock member mounted to the one member and retaining the bezel member to prevent it from moving at an arbitrary rotating position with respect to the case band member, the lock member having an arcuate spring portion accommodated in the accommodating groove, a pair of pushbutton portions protruding from the spring portion so as to be away from each other and extending through the passing portions to undergo a push-in operation from the outside of the one member, and a stopper portion provided on the spring portion and releasably engaged with the engagement grooves and adapted to be detached from the engagement grooves when the pushbutton portions are pushed in to be received by the reception groove.