Ok, so it may not fit the 'computer' part of
the charter, but it sure fits
the 'more than 10 years old' part... (and its borderline cute)
Just picked up a Commodore desk adding machine.
I certainly think that any electronic computing machine is appropriate
here.
Three of my prized items in my collection:
HP9100B desktop calculator
HP9835 desktop calculator/BASIC computer
Monroe/Litton 1101B desktop/deskside programmable calculator.
Tim.