WW1 American U.S. Navy issued pinset pocket chronograph no 539, circa 1917

For sale, this rare WW1 American U.S. Navy issued pinset pocket chronograph, no 539, dating circa 1917. Fitted with a fine 15 jewel Swiss movement with 2 Adjustments. It has just been fully serviced and is now in excellent full working order, including all functions. Mint unsigned enamel dial and deep blued full handset. Fully marked silver case, including movement cover. America joined WW1 late and military issued examples of Naval Issued pocket chronographs are rare and seldom encountered, especially in this type of condition. Price £895.00 inclusive of shipping to within the UK.