HP-67 with clear (transparent) back cover


Does anybody know if this type of HP-67 was actually manufactured by HP (as a pilot maybe), or is this a "customized" fix ?


Thank you!



My understanding is, that those were manufactured as sales demo units.
A serial# is barely visible, so it's very likely not a prototype unit.


Buenas tardes / buon giorno Giovanni,

AFAIK these were demonstration units from times when CAD was not readily available. So you could see where some space was left.



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