This is an antique 1880s coin silver pocket watch case for silver made by Droz & Perret.  This is marked on the inside of the front and back lid, "Droz Perret Coin Silver St. Imier 34530". The inside lid is marked as shown in my pictures and also has the same number on the bottom side, "34530". The case has a total weight of 51.2 grams.  I acquired this from an estate sale in Iowa.  A great addition to a collection. Please ask questions, look at my pictures, and read the detailed description. I combine items to save on shipping costs. Prompt payment is appreciated. Thank you for bidding. We look forward to seeing you.