What &quot;rebirth&quot;? HP still sells the 12C. It&#x27;s at WalMart and on Amazon.<p>I still have an original HP 11C, the &quot;scientific&quot; model with trig functions instead of present value. Works fine, and I use it occasionally. The batteries were last replaced in the 1990s. The record battery life is now 22 years and counting.<p>HP was very proud of the quality of those calculators.  You cannot wear off the lettering on the keys; it goes all the way through the key.