This is a stacking ashtray set from the 1950s made by the Fenton Glass Company. The pattern is hobnail milk glass in an octagonal shape in descending sizes of 6.5, 5.25, & 4 inches in diameter. The idea was to save room on your end tables by displaying them in the stacked position then passing them out to guests. Since smoking is on the decline, I would like to suggest an alternate use: a table centerpiece using floral foam between the layers. This would create a low, domed or pyramidal shape if short stemmed blossoms were used. These come from my parent's home, so they have only had one previous owner. The only problem is with the middle sized piece which has a small glass flake missing and a rough edge on the inside of one side. I attempted to photograph this flaw which is more tactile than visible.
Fenton Hobnail Milk Glass Stacking Ashtray Set