Waltham Watch Co, Waltham - A 9ct gold trench style wristwatch

circa 1920, the signed circular white dial, 25mm diameter, with black Arabic numerals (12 in red), blued spade and whip hands, subsidiary seconds register at 6 o'clock and chemin de fer chapter ring, signed 7 jewel mechanical crown wind movement number 21899345, case, 32mm diameter, verso hinged at 9 o'clock, plain and polished, inner signed and numbered 205883 with Birmingham hallmarks for 9ct gold and casemaker's mark of Dennison Watch Case Company (Aaron Lufkin Dennison), fixed wire lugs to an aftermarket brown leather strap with gilt pin buckle