These vintage porcelain thimbles were made in Japan.  Marked "CAS"

It is a unique and collectible item for sewing enthusiasts, particularly those interested in vintage pieces. The thimble's original design and material, along with its country of origin, add to its charm and sought-after appeal among collectors. Made of porcelain and featuring a delicate blue butterfly motif.

These thimbles are a lovely addition to any collection of sewing-related items.