US D431600 S
FIG. 1 is a front elevational view of a bubble blowing pen cap showing my new design in an exploded condition;
FIG. 2 is a front elevational view of FIG. 1 with the bubble blowing pen cap in a stored position;
FIG. 3 is a left side elevational view;
FIG. 4 is a right side elevational view; and,
FIG. 5 is a top plan view thereof.
The broken line showings of the writing instrument are for illustrative purposes only and form no part of the claimed design.