| 摘要 |
A watch comprises a push button 3 with an axis substantially perpendicular to the plane of the watch. It is slidable in a tube 2 which is fixed with respect to the bottom 1 of the casing and which is disposed in the interior of the casing. The push button 3 comprises a stem member 4 which is slideable within the tube 2, and a cap member 5 around the tube 2. A return spring 7 co-operates with the cap member 5 by way of the end which is remote from that which is fixed to the stem member 4, whereby the return spring does not require additional thickness of the casing to accommodate it.
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