George III's weighted cylinder
1762
1762
1762
1762
1762
1761
1761
1762
1762
1762
1762
1762
1790
1775-1795
1765
1761
1761-1762
1761
1762
1761
1780
1787-1800
1725-1795
1762
1762
1761
1761
1761
1761
1762
1762
1762
1762
1761
1762
1762
1761
1762
1762
1762
1761
1761
1762
1761
1762
1762
1761