The ornamental design for a commemorativecoin, as shown and described.
FIG. 1 is a top plan view of a commemorative coin showing my new design;
FIG. 2 is a bottom plan view thereof; and,
FIG. 3 is a right side elevational view with the left, front, and rear
elevational views being mirror images thereof.
The broken line showing of radiating light in FIG. 1 and of indicia in FIG.
2 is for illustrative purposes only and forms no part of the claimed
design.