1.75x2-1/8" die-cut stiff cardboard in black/gold with high gloss top. Depicts Gremlin wearing police hat. Warner Bros. copyright 1989. Reverse has bar pin. N. Mint. This is not screen-used; it is a promotional item that was given to journalists at press conferences.
However, the very same badge is used in the Leonard Maltin scene in Gremlins 2, but there's only one in the movie, and thousands were made as "promo" items.
However, it's produciton made and especially to be used in the movie, so it remains quite special :-)