Shiny, scooped glass, they may be handpainted and the black may actually be very dark blue. From Europe around the 1920's. New Old Stock, they've been in storage all that time; never circulated or used.  1/2" diameter or slightly larger, domed and plump, with a self shank. We are pretty sure this is the original card.  Limited supply; we only have one card of 24 buttons. The minor flaws the camera sees are barely noticeable in person in our opinion.