This is a Yukitsubaki (snow camellia) piece from Gyokusendo, a maker of tsuchiki copperware. It can be used to hold sweets or simply displayed. It appears to have been displayed for several years and then stored, as there are some marks as shown in image 5. Diameter: 21cm This item is no longer sold, and the original price was reportedly 40,000 to 50,000 yen.