How much is a dollar bill signed by Donald Regan worth?

The value of a dollar bill signed by Donald Regan, who served as the U.S. Secretary of the Treasury from 1981 to 1985, can vary based on factors such as its condition, rarity, and demand among collectors. Typically, a signed dollar bill might be worth around $10 to $50, but prices can fluctuate significantly based on the market and the specific circumstances surrounding the signature. For a more precise valuation, it would be advisable to consult a currency expert or auction house specializing in autographed memorabilia.