HP-12C very early versions wanted

[Bachelier]

Greetings all.

I currently own several HP-12Cs, one with the very low production number of 2151A05579. The one I bought new in 1983 (and still works) because I was a first-year Financial Analyst is 2201A. I wish I still had the box, but I chucked it.

Before you offer your model on Ebay, please let me know if you have an earlier Serial Number than I currently own, I'll be happy to pay a good price.

Of course excellent condition is desirable, but as long as it is working order (passes self-test) then I am interested. Sorry, not interested in "parts only" models.