Patent ID: 11860579
Assignee: THE SWATCH GROUP RESEARCH AND DEVELOPMENT LTD
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A device for fastening a back on a middle of a watch, the back comprising a cover arranged to form a bearing surface with the middle and a body arranged to rest in the middle, said device comprising:
a ring disposed between the back and the middle, said ring being arranged to ensure water resistance and indexing of the back,
wherein the ring comprises an upper part ensuring the water resistance and a median part comprising positioning means to ensure a precise and indexed placement of the back,
wherein the ring has a lower part, said lower part including at least one clip formed on an internal wall of the lower part to cooperate with a slot formed in the body of the back and at least one internal lug formed on the internal wall of the lower part to cooperate with a machining formed in the back, a height of the lug being greater than a height of the clip.