The ornamental design for a hiddenmountablestrap for billfold or the like, substantially as shown and described.
FIG. 1 is a left perspective view of a hidden mountable strap for billfold
or the like, showing our new design, the environmental broken-line showing
of a boot, partially cut away, forming no part of the design; and,
FIG. 2 is a perspective view of the strap in extended position.