This is the original TI-30 pocket calculator by Texas Instruments Serial no.: 85838 4176RCI Assembled in Italy Issues: - The transformer seems to be defective - measured output is around 10 mA - The pocket calculator lights up when connected to the transformer when connected to mains but does not work, presumably because it does not get enough power - The carrying case or etui does not open fully, it only opens as far as indicated in photos. One can insert into and remove calculator from case.