Closing Cap for Stamps

FIG. 1 is a top side perspective view of a closing cap for stamps; FIG. 2 is a front side elevational view thereof; FIG. 3 is a left side elevational view thereof; FIG. 4 is a rear side elevational view thereof; FIG. 5 is a right side elevational view thereof; FIG. 6 is a top side elevational view thereof; and, FIG. 7 is a bottom side elevational view thereof. The broken lines depict environmental structure that forms no part of the claimed design.