Magic Brain Calculator - Calculator - Painted metal, plastic - 1950-1960 - Catawiki

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Lot of 48 vintage and authentic objects from the 60s and 70s (48) - Catawiki

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

1950's Calculator

Battery Operated, Vintage & Classic Toys, Toys & Games - PicClick UK

1950's Calculator

Invicta - Rotomatic - Men - 1950-1959 - Catawiki

Wizard - A calculator, 1960s - Catawiki

Lot of 48 vintage and authentic objects from the 60s and 70s (48

1950's Calculator

Dugena - Troupier - Men - 1960-1969 - Catawiki

Wizard - A calculator, 1960s - Catawiki

Lot of 48 vintage and authentic objects from the 60s and 70s (48

1950's Calculator

Magic Brain Calculator - How to Add