Set of 3 Vintage Stackable Mugs Mod Pattern

Listing is for a set of 3 vintage stackable ceramic mugs featuring fun mod patterns! I can’t make out the stamp on the bottom. There are some cracks throughout each mug, I’ve provided a few photos showing a few different angles. Originally a set of 4, but I broke the handle off one and now use it to store my sewing needles! 3” H x 4.5” W (opening) x 5.75” W (w/ handle)