Clamshell Case for HP-35S Calculators

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9/11/25 - We now have 1 used original HP zipper case available. It shows noticeable wear and scoffing from use, but remains sturdy and functional. It is in Acceptable to Good condi tion. To purchase, select the HP, Used option. A generic, high quality replica of the hard, zip-up case with internal pockets that originally came with HP-35S and has been discontinued. Internal Dimensions: 6.25" x 3.25" x 0.8" The case will fit any calculator within these dimensions. This includes, but is not limited to, most HP financial and scientific calculators, but see if Small Zipper Case is a better fit. Show more