Howard Boston 17 Jewel Pocket Watch In A Keystone Gold Filled Case. It measures approximately 45.85 mm in diameter across and 11.6 mm thick. Serial number #. Adjusted # of Positions. The item “E. Howard Boston 17 Jewel Series 7 Pocket Watch In A Keystone Gold Filled Case” is in sale since Saturday, January 19, 2019. This item is in the category “Jewelry & Watches\Watches, Parts & Accessories\Pocket Watches\Antique”. The seller is “belmontcoinandjewelry” and is located in Dayton, Ohio. This item can be shipped worldwide.