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Many years ago I got a used HP-41C (still working). Only recently, I realized that its serial number is unusual :

Instead of being stamped on the appropriate area, it's printed on a silver sticker which holds the number : 47067993. Under the sticker, no other marking.

I wonder if it's a refurbished machine, or maybe something more special...

In advance thank you all !


Most likely the backpiece was changed.


I have one with the serial number printed a silver sticker glued in the black plastic sheet inside the battery compartment. The back case has no serial stamped on it.


Luiz (Brazil)

Edited: 20 Feb 2010, 10:05 p.m.

Hello Iqbal and Luiz,

Thank you for your answers; that leads me to other questions :

Is there a relationship between these non-standard serial numbers and dates ? or more likely, in the case of a repairing process, is it just a record number used at HP servicing department ? (which would make dating more difficult if not impossible)

Thanks again for your help !