The ornamental design for a graduatescale of watchbracelet clasp, as shown and described.
FIG. 1 is a front view of a graduate scale of watch bracelet clasp showing my new design;
FIG. 2 is a rear view thereof, in which the graduate scale is not visible;
FIG. 3 is a left side view thereof, in which the graduate scale is not visible;
FIG. 4 is a right side view thereof, in which the graduate scale is not visible;
FIG. 5 is a top view thereof, in which the graduate scale is not visible;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a perspective view thereof.
Broken lines in the drawing figures are used to show portions of the watch bracelet clasp which are not being claimed and thus form no part of the claimed design.