Patent ID: 7988350

Claim:
A watch case including: (a) a composite middle part through which pass stems of control members of a watch; (b) a back cover and a bezel closed by a crystal, wherein the back cover, the bezel and the crystal together define a space that houses a timepiece movement for displaying time data or non-time related data on a dial of the watch, wherein the composite middle part comprises i. an inner metallic middle part; and ii. an outer middle part made of a natural or synthetic mineral material, wherein the inner middle part comprises a top ring assembled to a bottom ring, wherein the top ring includes an axial extension that abuts on a peripheral shoulder of the bottom ring, and wherein the top ring and the bottom ring each have a radial extension oriented towards an exterior in order to block movement of the outer middle part with slight play by mechanically assembling the top ring and the bottom ring to each other, wherein the outer middle part is sandwiched between the radial extension of the top ring and the radial extension of the bottom ring, and wherein the bottom ring is arranged to allow assembly of the back cover and the timepiece movement.