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Hi Rick, With what resources I currently have at my disposal (working from home during COVID-19 pandemic), I’m having a hard time finding a calculator from around 1970 that exhibits all of the features you mention. Could it be that your former colleague’s calculator was made by a manufacturer other than Sharp? For instance, a calculator that would meet many (but not all) of the criteria you mention is the Smith-Corona-Marchant I RX (search object number 2017.0315.02 in our collection for an example of this calculator).