The ornamental design for a buckle and strapassembly for a girthstrap, as shown and described.
FIG. 1 is a perspective view of a buckle and strap assembly for a girth
strap showing my new design, with the cross-hatching being indicative of
conventional fabric and understood to entirely cover the area indicated,
and the broken-line showing of the girth strap being for illustrative
purposes only and forming no part of the claimed design;
FIG. 2 is an enlarged top plan view thereof;
FIG. 3 is a side elevational view thereof with the opposite side being
substantially similar in appearance.