I have an HP 12C on my desk and another in my briefcase. I still have the first one that I bought in 1982 in a drawer. It works fine, but it is hard to make out the print on most of the keys and I lost the battery cover years ago.
I left my first HP12C in a NYC cab. I bought one the next day and I still have it. Bringing it to meetings is a great way to help distinguish myself without being smart.