The ornamental design for a retro can, as shown and described.
FIG. 1 is a right perspective view of a retro can showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is another front view of a retro can in accordance with showing another embodiment of the new design, wherein the body of the retro can is shown broken away to illustrate non-specified length.
It is understood that the only difference between the first and second embodiment is the body of the retro can shown broken away to show non-specified length.