Check the listing for details. VINTAGE TEXAS INSTRUMENTS DATA CHRON TI-1790 ELECTRIC CALCULATOR & CLOCK. Condition: Used. Listed at 15.00 USD. As I said before, This is a lightly used TI=1790, but currently it's not working. I think it needs the battery replaced, but I can't be sure. Top that off with its calculator, clock, alarm and stopwatch functions this combo was a very desirable product.
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