Unsigned, retailed by Fritz Piguet & Bachmann, Genève, Case No. 12149
20-jewel nickel divided ¾ plate movement with Potter's signature "AP" bridges, jewels in gold settings, straight line escapement with hook shaped counterpoise, bimetallic balance, blued overcoiled spring, articulated regulator with index on barrel bridge, stem wound and set, gold cuvette engraved with description of the watch, white enamel dial with minute ring enclosing arabic chapters, subsidiary seconds at 3 o'clock, date ring at 9 o'clock, blued breguet hands, retailer's monogrammed case

51mm 101.8 grams