HP-12C very early versions wanted

[rprosperi]

(01-07-2018 08:11 PM)nesral Wrote:  Hi There, I have an HP 12C, there is a number stamped in the bevel edge to the right of the battery door: CN05200721. The calculator is new looking so i don't think it is early. where is the serial number located?

That is the serial number, your 12C was made in China in 2000 (or possibly 2010). About 20 (or 30) years too late to be considered an early 12C.

See here to see how to read the serial number.