Abstract: The screws 8 which fix the printed circuit 1 to the plate 2 of the body of the movement extend through portions 4a of the copper layer 4 of the printed circuit located beneath openings 11 formed in the substrate 3 of the printed circuit. The portions 4a of the metallic layer 4 may be preformed into dished parts which engage in depressions 12 in the plate 2. As a result of this arrangement, the heads 8a of the screws 8 are recessed into the printed circuit board and countersunk into the thickness of the plate `, which avoids all risk of inadvertent contact with the negative pole of the battery 6 which supplies the movement or with the metal strip 7 in contact with this negative pole.