
Pivoted-detent escapement watch by John Arnold
1776
1776
1640
1501-1599
1870
1880-1920
1701-1721
1795-1805
1818
1790-1810
1914
1794
1904
1850-1900
1836
1900-1930
1939
circa 1860
1948-1952
1834-1889
1834-1889
1810
1874
1894
1900
1751-1800
circa 1850
1866
1922-1948
1780-1820
1780-1820