Abstract: A modular wristwatch assembly comprises a bezel having a transparent watch crystal mounted therein, first and second pairs of watch band lugs joined to opposite exterior side edge regions of the bezel, a rigid watch back member, and a rigid, annular watch movement retaining member disposed between the bezel and the back member. Included in the assembly are a watch movement, having a watch face and hands for indicating the time, installed in the watch movement retaining member and having operating controls extending outwardly therethrough. There is further included a decorative ring installed between an under surface of the bezel and an upper surface of the watch face, the ring being around peripheral edge regions of the face so as not to interfere with the time indicating means and being visible through said watch crystal. Screws are used for detachablably attach the bezel and the watch back member together with the watch movement retaining member and watch movement held therebetween.