Perspective drawing apparatus, incomplete, in integral mahogany case
1760-1770
1760-1770
1785
1761
1762
1762
1776-1780
1776-1780
1776-1780
1778
1783
1785
1785
1784
1762
1764
1762
1762
1769
2000-100 BCE
1761
1776
1757
1784
1762
1762
1762
1777-1785
1778
1782
1787
hallmarked 1788
1762
1762
1770
1775-1785
1785-1789
1758-1773
1758-1769
1758-1769
1758-1769
circa 1780
1770
1990-96
1771
1775
1776-1780
1776-1780
1761
1761
1761