Low serial numbers (00000001-00000009) greatly increase value.

Repeating serial numbers, like 11111111, are highly collectible.

Star notes, marked with a star, are rare and more valuable.

Ladder serial numbers (12345678) command higher prices.

Palindromic (radar) serial numbers, such as 12344321, are sought after.

Error serial numbers, like mismatched digits, boost worth.

Solid serial numbers, like 55555555, are prized by collectors.

Older bills with unique serial numbers often exceed face value.

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