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Overlays on HP-18C
05-24-2017, 09:07 PM (This post was last modified: 05-24-2017 09:10 PM by HP-Collection.)
Post: #1
Overlays on HP-18C
Guys, does someone of you know why there are different labels on the left side of the HP-18C. Here are two different versions I just found during the last month in the bay....

(Sorry, updated the post as there was an error on my side)


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05-24-2017, 10:06 PM
Post: #2
RE: Overlays on HP-18C
Key observation - CHARY - an aftermarket vendor.

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SlideRule
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05-25-2017, 01:26 AM
Post: #3
RE: Overlays on HP-18C
Chary made overlays for many of the financial machines; probably the earliest was the 12C, however since that model was around so long, it's hard to tell. Overlays for the 12C could have been introduced 5 years before the 18C was launched, or 20+ years after the 18C was discontinued...

But I would guess that the 12C versions were first.

Thanks for sharing that Matthias, I've not seen 18C overlays before.

--Bob Prosperi
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