This vintage  features a dark green bowler hat with a black band and shamrocks for St. Patrick's Day. The lapel pin is made of plastic, but has a textured finished that looks like wood grain with cracks.

The back is marked "Hallmark Cards, Inc."

Measurements:

Height: 1 1/4 inch (3.2 cm)
Length: 1 7/8 inch (4.8 cm)
Thickness: 1/4 inch (6 mm)