The ornamental design for an invertiblecheekpiece mount, as shown and described.
FIG. 1 is a front perspective view of the present invention;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front 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 rear view thereof;
FIG. 9 is a front view thereof showing environmental structure in broken lines; and,
FIG. 10 is a rear view thereof showing environmental structure in broken lines.
The broken lines in FIGS. 1-8 showing portions of the article are for illustrative purposes only and form no part of the claimed design. The broken lines in FIGS. 9-10 showing environmental structure form no part of the claimed design.