These mistakes will pay off

June 17, 2009 5:54:22 AM PDT
Mistakes can be expensive -- especially when they're on stamps.

One man's collection of more than 3,000 incorrectly printed stamps is expected to sell for millions.

The stamps will go up for auction tomorrow and Friday.

Officials at the Spink Shreves Galleries say the collection amassed by late stockbroker Robert H. Cunliffe could bring in more than 4 mil.

He collected thousands of so-called inverted stamps, which have elements that were printed upside-down.

One strip of four stamps from 1901 shows an upside-down electric car.

That could go for upwards of 300-grand.

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