How much are old home computers worth?
9 July 2013 Last updated at 13:16 BST
A computer from 1976 that originally retailed for $666.66 is to be auctioned and could fetch up to $500,000.
The Apple-I computer was one of the first 25 computer elements designed by Steve Jobs and Steve Wozniak in their famous California garage.
About 200 were made but most have disappeared or been discarded, with only around 30 to 50 still believed to be in existence.
The model that is going under the hammer had been stored away in a cardboard box collecting dust by a retired school psychologist.
Speaking to the BBC's Aaron Heslehurst, Chris Hall from media technology website Pocket-lint.com explains why it is so valuable, and how you too could have a small fortune stashed away somewhere.