Vintage 1977 Casio FX-2000 Scientific Calculator Japan Case & Manual Working | eBay
Amazon.com: Casio FX-991SP CW – Scientific Calculator, Recommended for Spanish and Portuguese Curriculum, 5 Languages, More Than 560 Functions, Solar, White : Office Products
Amazon.com : Casio FX-991EX Engineering/Scientific Calculator, Black, 3" x 6.5" x 0.4" : Office Products