Very unusual cigarette case, possibly by Elgin co. The case operated by pulling the sides apart and cigarettes were placed between the sides. They pull back under some spring pressure within the case. The case is marked "Pall Mall Rounds" and has the PM company image engraved inside the case (see photo). Case measures 2 1/2 by 2 7/8 inches by about 1/4 inch closed. Please send questions before bidding or buying. Thanksfor looking and have a great day.