This is a rare vintage Unisonic 890C calculator that has been tested and is in good working condition. It's a great addition to any vintage electronics collection. The brand is Unisonic and the model number is 890C. This calculator is a vintage item, so it has a unique style and design that sets it apart from modern calculators. It's in the categories of Consumer Electronics and Vintage Electronics, specifically Vintage Calculators. The calculator is of the vintage era, so it has a special appeal to collectors.
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