This very cool vintage thumbs up brooch is fairly large at 2 3/4" from the tip of the thumb's nail to the opposite tip of the cuff. It dates from the 1970's. It has a copyright symbol and not a patent number. Made by M.J. Enterprises, it has their logo on a soldered tag on the back.
The brooch is in excellent vintage condition, no loss of enamel on the bright red painted nails. The gold plating is intact and the clasp works well. It is fairly heavy at 40 gram, so better suited for heavy fabrics.