Wanted

Calculators, Adding Machines and Arithmometers. Please email me if you've got one.

Centigraph Adding Machine

​Invented by Arthur Ewing Shattuck in 1880. Produced first by The Centigraph Company of New York, NY and later by The American Adding Machine Company of Atlanta, GA. Have one for sale? Please email me at Antikey.Chop@gmail.com

Spalding Adding Machine

This adding machine was invented by Cyrus G. Spalding of Boston, MA, ca.1874. Have one for sale? Please email me at Antikey.Chop@gmail.com

The Adder

Invented by Arthur Postans in 1902 and was produced in the United Kingdom. Have one for sale? Please email me at Antikey.Chop@gmail.com

Thomas de Colmar Arithmometer

This calculator was invented by Charles Xavier Thomas de Colmar of Paris, France, ca.1850. Have one for sale? Please email me at Antikey.Chop@gmail.com

McFarlane's Calculating Cylinder

This calculator was invented by McFarlane of Glasgow, Scotland. Have one for sale? Please email me at Antikey.Chop@gmail.com

Tate Arithmometer

Technically, this is "Tate's improved arithmometer." It was invented by Samuel Tate of London, ca.1902. Have one for sale? Please email me at Antikey.Chop@gmail.com

Baldwin Arithmometer

This calculator, also known as an "Accountant's Assistant," was invented by Frank Stephen Baldwin of St. Louis, Missouri, ca.1873. Have one for sale? Please email me at Antikey.Chop@gmail.com

Comptometer (Wood)

This calculator was invented by Dorr E. Felt of Chicago, IL in 1887. It was produced by the Felt and Terrant Manufacturing Company. I would be interested in examples made primarily of wood. Have one for sale? Please email me at Antikey.Chop@gmail.com

Commonwealth Adding Machine

This adding machine was invented by George Browning. It was produced by the Commonwealth Adding Machine Company of Muskegon, MI, ca.1915. Have one for sale? Please email me at Antikey.Chop@gmail.com

Chapin Adding Machine

This calculator was invented by Gilbert Chapin of Connecticut, ca.1870. Have one for sale? Please email me at Antikey.Chop@gmail.com

The Infaillible Calculator

L'Infaillible Calculateur was made in France. Have one for sale? Please email me at Antikey.Chop@gmail.com

Comptograph

This adding machine was invented by Dorr E. Felt of Chicago, IL in 1887. It was produced by the Felt and Terrant Manufacturing Company. Have one for sale? Please email me at Antikey.Chop@gmail.com

Addsubtractor

The Addsubtractor was made in Sydney, Australia by the company of Bratz and Waldron Pty. Ltd., ca.1946. So, yes, this calculator is fairly modern, but it is really attractive. It was used to calculate Pounds Sterling, Shillings and Pence. Have one for sale? Please email me at Antikey.Chop@gmail.com