Otis King leather cased pocket calculator with instructions marked 'Made in England'; together with an oak boxed set of travelling gold scales, 2 leather cased pocket drinking and cutlery sets, a boxed bloodletting set, and a mahogany boxed monocular microscope, late 19th and early 20th century, (6 items), the boxed microscope 7 cm high, 22 cm wide, 9 cm deep