It is mechanical calculator  slide adder marked "PRODUX"  made in Germany ("Otto Meuter Rechenmaschinenfabrik")  in good (used) condition/ original, functional.  Original cardboard case etui is included.   display type: 9/10 digits  Stylus / stick  is new and is included too.  measurements: 15 x 9 cm.  (6" by 3.5")  weight: 158 g. 

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