This striking button with its flowerpot logo and Made in England on the back identifies it as a bimini button. It is a lovely item. No chips or cracks.
Info from internet: A vintage ‘Horse’ design Bimini Glass Button attributed to Dame Dame Lucie Rie 1902-1995 made Ceramic & Glass Buttons for Fritz Lampl at Bimini Glass (later named Orplid) during the 1940s & 1950s.