Buttons are 1.75” to 3”. The 9” “Saturday Night Fever” 1977 piece was designed to serve as the face of a clock. Front is constructed like a button while reverse has stiff black cardboard insert. There is a tiny white dot at the center where the piece should have been pierced to place clock hands with a battery mechanism mounted on the reverse. None of this has been done. Couple of tiny white rubs on extreme left edge but barely showing from the front. Only example we’ve seen. Buttons are circa late 70s with a 3” one from Canada maker with text in French. Next to it is a European issue with text in German. The other six reference either “Grease” or “Staying Alive.” These are all Exc. to Mint.