How do you know a Blanknut is not a fake?


I am seeing quite a few Blanknuts for sale on the net [ EBay as well as the HP classifieds ]. Actually I was thinking of purchasing one.

But I was going through a manual called 'A guide to HP Handheld Calculators and Computers' by Wlodek Mier-Jedrzejowicz [ quite a good book for any HP Calculator collectors I might add ]and in it is a colour photo of a Blanknut HP-41 but there is a small plastic bar over the USER and PRGM keys. I was just wondering if it is possible to 'doctor' a normal HP41 to appear as a Blanknut.


Not all the blanknut 41's have the plastic bar. I don't think it would be too easy to rid the keys and the face of their markings. I have a 41cx halfnut blanknut, no plastic bar, and the logo on the end of the calc is in a definitely different script than a comparable 41cx, the big difference being there is no "41cx" in the label. So, I think if you were to look at that part, or is it just mine? BTW, I'm keeping this one. Dave


My 41CX BlankNut / Halfnut have the plastic bar that cover the user and program keys. I think that because the company that ordered the blanknuts didn't want their users to turn off user mode or enter the program mode. I bought 3 of these at a surplus store for $5.00 each back in 94


My 41CV BlankNut / Fullnut has the plastic bar that covers the user and program keys, but it has no tag on the end or back to indicate what version it is.


As best I recall, the key markings are part of the key rather than painted on, so it should be very difficult to make them disappear. The blanknut photo on this site does not show the plastic bar over the user and prgm keys:

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