Duplex watch in case
1770-1805
Duplex watch in case
1800-1806
Duplex Pocket Watch in Silver Case by Molyneux and Sons, 1815-1830
hallmarked 1830
Ladies keyless watch with duplex escapement
1890
Duplex watch in case
1809-1868
Duplex with going barrel
1795
Duplex Watch Mechanism by S&C Joyce, 1805-1815
1805-1815
Spring-Driven Watch Mechanism of the 'Addison' model, 1885-1895
1885-1895
Pocket Watch in Guilt Silver Case by Thomas Earnshaw, 1810-1824
hallmarked 1824
Pocket Watch Mechanism by Louis Recordon, 1800-1820
1800-1820
Movement with double wheel duplex escapement by Charles Vincent
1820
Duplex watch in triple case
1762-1800
Duplex Pocket Watch in Silver Case by James McCabe, 1820-1833
hallmarked 1833
Going-barrel watch movement, with duplex escapement
1801-1830
Duplex, by T. Earnshaw
1801-1829
Duplex with compensating curb
1802-1835
Pocket Watch Mechanism by Viner & Co, 1820-1840
1820-1840
Pocket Watch Mechanism by Grandjean Pere et Fils, 1860-1875
1860-1875
Duplex watch in pair case
Duplex Pocket Watch in Gilt Silver Case by Vulliamy, 1810-1823
hallmarked 1823
Duplex watch in case
1747-1807