File:Unisonic 21 Blackjack Computer Console With Calculator, with package, Model 21-D3 (aka Model D-3), VFD, "Play and Enjoy Unsonic 21 With Jimmy the Greek", Made in Taiwan, Copyright 1977 (Electronic Game).jpg -
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Amazon.com : Tandy Corporation Radio Shack Electronic Blackjack Calculator Led Handheld Game Model#ec-21 Complete, with Manual, with Cover and Calculator : Office Products
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Enterprex BJ-21 Blackjack Calculator Vintage Gambling Game Video Handheld | eBay
Enterprex BJ-21 Blackjack Calculator Vintage Gambling Game Video Handheld | eBay
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Amazon.com : Tandy Corporation Radio Shack Electronic Blackjack Calculator Led Handheld Game Model#ec-21 Complete, with Manual, with Cover and Calculator : Office Products
File:Tandy Blackjack calculator, front, power on in Game mode (23289985093).jpg - Wikimedia Commons