I think it is probably a silveroid case, and the crystal is very clean. This is a very nice rare pocket watch that anyone will be proud to own. In 1866, right around the time that John C. Adams from Waltham Watch Company joined a partnership that spawned the Elgin National Watch Company, he went to Rockford, Illinois with the idea of opening a factory there. The residents of the town were not enthusiastic about the idea and the entrepreneur took his idea to Elgin, Illinois.
In its 39 years of operation, the company manufactured just under 1 million watches half of which were produced between 1902 and 1915. The item "Very Nice Rare 1890's Rockford Large 18s Pocket Watch Runs" is in sale since Sunday, December 23, 2018. This item is in the category "Jewelry & Watches\Watches, Parts & Accessories\Pocket Watches\Antique". The seller is "beecreektc" and is located in Murray, Kentucky.
This item can be shipped worldwide.