The buckle surface and one end of the underframe are respectively connected with the watch strap, wherein the buckle surface is slotted as a whole, the bottom surface of the buckle surface is provided with a circular buttonhole which is mutually locked with the dialing nail on the underframe; the underframe is composed of a frame bottom, a long arm and a short arm, one end of the long arm and the short arm are rotationally connected with the frame bottom, the other end of the long arm is connected with the watch strap, and the other end of the short arm is connected with the buckle surface. The utility model has the advantages of firm connection, no deformation, strong integrity, elegant appearance and easy repair.
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