The Vintage Radio Shack Blackjack 21 calculator, also known as the Radio Shack EC-21, is a sought-after collectible piece for vintage electronics enthusiasts. This calculator, with its classic blackjack 21 game and four additional functions, comes with its original case and manual, adding to its charm and authenticity. The Radio Shack brand ensures quality and durability, making this calculator a unique and valuable addition to any collection. :::: BATTERY FLAP MISSING::::