Vintage casio calculator from the 1990's. Working good. On the case it reads 'Casio'. On the front it reads 'Casio  scientific calculator fx-83 W4  S-V.P.A.M.' On the back it reads 'Casio rating: DC 1.5V 0.0001W  use battery LR44 * 1   CE   Made in China  Casio computer Co. Ltd Tokyo Japan'     'P'   . 50 Keys. Precision 12. Logic  formula. Display type LCD. Length 150mm. Width 76mm. Thickness 11mm. 1996-2000 era.