FIG. 1 is a perspective view of a buckle showing my new design; FIG. 2 is a front view thereof; FIG. 3 is a rear view thereof; FIG. 4 is a plan view thereof; FIG. 5 is a bottom view thereof; FIG. 6 is a left side view thereof; a right side view being symmetrical to the left side view; FIG. 7 is a sectional view thereof taken along line 7—7 in FIG. 2; and, FIG. 8 is another sectional view thereof taken along line 8—8 in FIG. 4.