This is an Antique Crescent Watch Case. The date of manufacture is anywhere from 1905 when this stamp was issued. This is 14k Gold Filled. I have had this in my jewelry box since the 1960′s. The case measures 38mm around the outside diameter. The inside diameter of the opening measures 36.5mm. It weighs 27.04 Grams. There are many markings inside the case. The numbers stamped in 3 different places are #228375. It has the manufacturers stamp as well. It is in magnificent condition.