A BRASS 'POKE DIAL' OR PORTABLE RING SUNDIAL FIRST HALF 18TH CENTURY constructed for a latitude of fifty degrees, engraved with various letters, including 'S H W' standing for Summer, Winter and possibly Herbst the German word for Autumn, in a later box with papers and letters relating to the dial, two from the Director of the Science Museum in 1931 3.9cm diameter PROVENANCE 'A Lifetime of Collecting' - The Property of a Gentleman.