A timepiece (1) including a middle (110) and an interchangeable bezel (200) fastened to said middle (110) by relative rotation of the bezel (200) relative to the middle (110), about a central axis (B), between an interlocking position and a locked position, by a bayonet fastening device (300), said bayonet fastening device (300) including first fastening elements (300a) formed on the middle (110) and second complementary fastening elements (300b) formed on the bezel (200), wherein the bayonet fastening device (300) includes a mechanical coding system (210, 116) for defining a single position in which said bezel (200) can be interlocked with the middle (110).

The disclosure provides an example watch. The watch includes (a) a housing having a first face and a second face and a cavity extending therebetween, where the first face includes a first bezel coupled to a first transparent watch crystal, (b) a disc disposed within the cavity between the first face and the second face and coupled to the housing, where the disc comprises a watch face for indicating time, and (c) a case cap removably coupled to the second face of the housing, where the case cap includes a casing having a first side configured to mate with the second face of the housing and a second side configured to be engraved.

The disclosure provides an example watch. The watch includes (a) a housing having a first face and a second face and a cavity extending therebetween, where the first face includes a first bezel coupled to a first transparent watch crystal, (b) a disc disposed within the cavity between the first face and the second face and coupled to the housing, where the disc comprises a watch face for indicating time, and (c) a case cap removably coupled to the second face of the housing, where the case cap includes a casing having a first side configured to mate with the second face of the housing and a second side configured to be engraved.

A watchcase with a detachable bezel and a watch thereof are provided. The bezel is detachably installed on an upper end of the watchcase, the watchcase including at least two clamping members, and the bezel including at least two slots corresponding to engage with the at least two clamping members, each of the at least two clamping members including a clamping portion, an elastic member applied to lock the clamping portion in the corresponding slot, and an operation member connected to the clamping portion and controlling the clamping portion to move so as to the clamping portion detach from the slot. The improved bezel can detachably connect to the watchcase by the clamping member, which is highly applicable without being limited to circular watchcases, so that irregular watchcases such as square watchcases and barrel-shaped watchcases can also be used without needing other tools to disassembly and assembly the watchcase.