Silver English Duplex

An early 19^th Century English duplex in a silver open face case.  Full plate gilt keywind fusee movement, Polished steel mainspring setup ratchet and click.  P  Harrison's maintaining power. Plain cock with diamond endstone, polished steel regulator, compensation balance with blue steel spiral hairspring.  Duplex escapement with gold locking roller, gilt escape wheel, pivots with endstones.  White enamel dial with subsidiary seconds, Roman numerals, blue steel hands.  Plain silver open face case, gold hinges, maker's mark "JH" in a rectangle.