Draw lines in a spiral pattern. The recognition point is the linear groove on the edge of diamond inlay, and the groove version is one of the earlier designs.

The plum blossom nail inlay method is used for diamond inlay. The identification point is the rectangular groove of the rotating shaft, and the version without groove is one of the earlier designs.

Printing arrangements. In addition to the different bracelet numbers, as well as the possibility of iterative replacement of graphic imprints, the line regularity of fonts, and the depth and clarity of fonts.

The structure of the bracelet. There is a groove on the outer side of the rotating shaft of the bracelet, and the switch of the bracelet is on the other side of the rotating shaft. Rectangular groove is a common way recently, and the version without groove is one of the earlier designs.