2 Vintage Manual Calculators. 1 is Chadwick Magic-brain Calculator 1950-1960's

Chadwick Magic Brain Calculator, B1633.01

Affordable calculator For Sale, Vintage Collectibles

American Stationer, antique & vintage staplers, adding machines, hole punches, check protectors, calculators, pencil sharpeners, scales, tape dispensers and all other office equipment

Magic Brain: Last Gasp of the Mechanical Calculator

Magic Brain Calculator with instructions. 1960's.

John Wolff's Web Museum - Slide Adding Machines

k09-the_magic_numbers_of_dr._matrix_0

Vintage Chadwick Magic Brain Calculator on A La Modern

John Wolff's Web Museum - Slide Adding Machines

File:Vintage Magic Brain Mechanical Pocket Calculator, Made in Japan (11591234036).jpg - Wikimedia Commons

Chadwick Magic Brain Calculator

Magic Brain Calculator (Japan) w/instructions Unused

Vintage Alco Magic-brain Calculator - In Original Packaging (#EE147)

Progress is fine, but it's gone on for too long.: The Magic Brain