Banknotes with "solid" serial numbers have routinely sold for thousands on auction sites — if they're in excellent condition.

Serial numbers, paint and logos can look convincing. Golfers need to verify the seller before trusting the club. The ...

Most electronics come with a bevy of numbers etched into their frames, stamped on their undersides, and emblazoned onto their boxes. But why? Well, the short answer is that they're needed for model ...