The ornamental design for a pin, as shown and described.
The claimed Pin is used for sewing and is well adapted to be stored in a Pin Box or Pin Case as disclosed in co-pending U.S. Design application Ser. No. 29/623,579 and as part of the Ensemble disclosed and claimed in co-pending U.S. Design application Ser. No. 29/623,584, both filed of even date herewith and both being incorporated herein by reference in their entirety.
FIG. 1 is a perspective view of a pin;
FIG. 2 is a plan view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof; and,
FIG. 5 is a perspective view of the pin shown with environment.
The broken lines depict environment that forms no part of the claimed design.