1. IN A WATCH: AN ANNULAR CASE MEMBER DEFINED BY INNER AND OUTER WALL PORTIONS, AN ANNULAR RECESS IN ONE RADIAL END FACE OF SAID MEMBER BETWEEN SAID WALL PORTIONS; A GLASS COMPRISING A PERIPHERAL RIM WHICH IS SECURED IN SAID RECESS; AN INNER MEMBER COMPRISING A RADIAL DIAL PLATE REGIDLY MOUNTED ALONG ITS OUTER PERIPHERY TO AN ANNULAR RING WHICH EXTENDS AXIALLY FROM ONE SIDE OF SAID PLATE, SAID RING BEING REMOVABLY FITTED WITHIN SAID INNER WALL PORTION THROUGH THE END OF SAID CASE MEMBER OPPOSITE TO THE END ON WHICH IS LOCATED SAID ANNULAR RECESS, THE INNER WALL PORTION OF SAID CASE MEMBER AND THE OUTER WALL OF SAID RING COMPRISING COMPLEMENTARY ABUTMENT SHOULDERS AT ONE AXIAL END THEREOF, SAID SHOULDERS ABUTTING EACH OTHER AND THEREBY PREVENTING MOVEMENT OF SAID RING IN ONE AXIAL DIRECTION RELATIVE TO SAID CASE MEMBER; A WATCH MOVEMENT MOUNTED QITHIN THE ANNULAR RECESS DEFINED BY SAID RING AND SECURED TO SAID RING ON ONE SIDE OF SAID DIAL PLATE; THE INNER WALL PORTION OF SAID CASE MEMBER AND THE OUTER WALL OF SAID RING COMPRISING COMPLEMENTARY ENGAGING CIRCUMFERENTIAL SURFACES WITH SAID SURFACES COMPRISING MUTUALLY ENGAGING SECURING MEANS FOR RIGIDLY SECURING SAID RING TO SAID CASE MEMBER WHEREBY SAID RING AND CASE MEMBER STRUCTUALLY COMPLEMENT EACH OTHER AND FORM AN INTEGRAL STRUCTURAL UNIT.