The ornamental design for a perpetualcalendar, as shown.
FIG. 1 is a front elevational view of a perpetual calendar, showing my new
design, the rear elevational view being unornamented except for the
grommets; and
FIG. 2 is a left side elevational view, the right side elevational view
being a mirror image thereof.
The arrangement of the abbreviated week day designations shown in FIG. 1 is
for illustrative purposes only.