A watch comprises a casing, the casing is protruded with an abutting ring portion with its center being a hollow portion;
- the abutting ring portion is provided with a receiving groove, which is provided with a convex portion;
- the two sides of the convex portion form two grooves and a through hole penetrating through the casing and the convex portion;
- the top and bottom surfaces of the casing are provided with a plurality of pressing protrusions arranged at equal distance, wherein one pressing protrusion is located above the receiving groove;
- an accommodating space is provided between the pressing protrusion and the abutting ring portion;
- a first watch-surface is placed on the top of the abutting ring portion, and the movement components on the first watch-surface are located in the hollow portion;
- a second watch-surface is placed on the bottom of the abutting ring portion, and the movement components on the second watch-surface are located in the hollow portion;
- an adjusting and snapping component is composed of an adjusting screw, an assembly connector, an H-shaped snapping member and an abutting screw;
- the assembly connector is convexly provided with an engaging portion and a threaded through hole, and is assembled to the through hole from the outside of the casing through the engaging portion;
- the adjusting screw is provided with an external thread portion and a hollow thread portion, and is screwed and assembled with the assembly connector from the outside of the casing;
- the external thread portion of the adjusting screw is protruded from the assembly connector;
- the H-shaped snapping member is provided with a threaded through hole and two raised portions on both sides, forming a recess in the middle of the two raised portions;
- the H-shaped snapping member is screwed to the external threaded portion of the adjusting screw;
- the abutting screw is screwed to the hollow threaded portion of the adjusting screw;
- through the forward rotation of the adjusting screw, the H-shaped snapping member can be moved toward the convex portion of the casing, so the two raised portions are attached to the two grooves;
- when the adjusting screw is reversely rotated, the two raised portions are away from the two grooves;
- when the H-shaped snapping member abuts against the abutting screw, movement stops;
- a snapping ring is downwardly provided with a flange, which is provided with a plurality of engaging protrusions arranged at equal distance;
- the flange is provided with a notch on both sides of one of the engaging protrusions;
- the inner ring of the snapping ring is annularly provided with a pressing portion and a groove;
- the transparent cover is engaged with the groove;
- the two snapping rings are respectively engaged with the top surface and the bottom surface of the casing;
- the snapping ring is disposed on the abutting ring portion through the plural engaging protrusions;
- the pressing portion is pressed against the first watch-surface and the second watch-surface to move the engaging protrusions and the two sides' notches of the snapping ring onto the convex portion and the two sides' grooves;
- the adjusting screw is forwardly rotated to make the H-shaped snapping member close to the convex portion, so that the two raised portions pass through the two notches of the snapping ring and attach to the two grooves;
- the engaging protrusions are located in the accommodating space between the convex portion and the pressing protrusion, and are also engaged in the recess of the H-shaped snapping member;
- and other plural engaging protrusions are all located under the plural pressing protrusions, achieving the effect of engaging and fixing the two snapping rings to the casing.