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Very Rare 1980 CASIO C-70 (133) Japan R Calculator 35mm Watch - New Battery | eBay
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FS - Casio C-80 Digital | WatchUSeek Watch Forums
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Casio Calculator Watches Are Pre-Apple 1980s Icons Still On Sale Today - Bloomberg
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Tech Hunters: Refreshing Casio's classic calculator watch | Engadget
Casio C-80 Ultra rare 1980 the First for $526 for sale from a Private Seller on Chrono24
