Vtg 1960's Mechanical Pocket Calculator - Made in Japan - Magic Brain

, This one is not branded Linemar or Vanguard Magic Brain but this is the exact same modelling and moulding. In working order (see video)

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File:Vintage Fedtro Precision Mechanical Pocket Calculator, Made In Japan, Sold For 69 Cents, Circa 1966 (16385763876).jpg - Wikimedia Commons