Patent ID: 7027359

Claim:
A watch comprising a case having a back, a movement contained in said case and an electronic module for storing information able to communicate by radio signals with a device for reading and/or writing said information, said module comprising a cup-shaped amagnetic material base, an integrated circuit having at least two connecting terminals and fixed to a flat bottom of said base and a send and receive antenna comprising a coil also fixed to to the flat bottom of said base and surrounded by a lateral wall of said base, the coil consisting of an electrically conductive wire having two ends connected to respective connecting terminals of said integrated circuit, said coil having an annular shape and surrounding a space in which said integrated circuit is placed, wherein said electronic module is housed at least for the most part in a cavity in the back of the case open towards the outside, and wherein the thickness of said lateral wall increases slightly and continuously from its base adjoining said flat bottom to its top so that it has an exterior surface co-operating with an internal wall of complementary shape of said cavity and constitutes a dovetail joint between said electronic module and the back of said case.