The ornamental design for a buckle, as shown and described.
FIG. 1 is a front, top and right side perspective view of a buckles, showing the claimed design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a cross-sectional view taken along line 8-8 shown in FIG. 2;
FIG. 9 is a back, top and left side perspective view thereof;
FIG. 10 is a back, bottom and right side perspective view thereof; and,
FIG. 11 is a reference view showing the buckle in use.
The long dash short dash broken lines and arrows shown in FIG. 2 are used to identify the cross-sectional view and form no part of the claimed design. The broken lines shown in FIG. 11 depict environment and form no part of the claimed design.