‘Visual glasses’ designed by Benjamin Martin
1756-1800
1756-1800
1785
1794
2000-100 BCE
1752
1770-1800
1751-1800
1778
circa 1800
1751-1800
1762
1778
1762
1783
1785
1785
1780-1800
1769
1755
1758-1773
1758-1769
1761
1781-1790
1761
1782-1793
1757
1784
1762
1784
1758-1769
1785-1790
1762
1798
1762
1762
1797
1752
1762
1752
1762
1755
1758-1769
1771-1800
1777-1785
1782
1787
1764
hallmarked 1788
1762
1762