1930's Fowlers Magnum Long Scale calculator in leather case

Fowlers Universal Calculator

1930's single sided Fowlers Textile Calculator, Short Scale Type

1930s Fowlers Magnum Long Scale calculator & presentation case with instructions

19th century Boucher's Calculigraphe calculator by Henri Chatelain

Antique Mahogany 1921 Stanley Fuller Spiral Cylindrical Slide Rule Calculator

Vintage Fowler 12-10 calculator/circular slide rule, original leather case

Late 1940's Otis King Model L Type B cylindrical slide rule & calculator