1. Condition: The condition of the banknote is crucial in determining its value. Factors such as tears, folds, creases, stains, and overall wear and tear can significantly impact its worth. A note in uncirculated or excellent condition will generally command a higher value.
2. Rarity: The rarity of the banknote also plays a role in its value. The 1928 $1 bill with the series A81958408A is not particularly rare, as it was part of a larger print run. However, any unique features, such as exceptional signatures or rare serial numbers, can increase its rarity and value.
3. Historical Significance: The historical significance of the banknote is another important factor. The signatures of Andrew W. Mellon, the then-Secretary of the Treasury, and Harold Theodore Tate, the then-Director of the Bureau of Engraving and Printing, add historical significance to the note. If there are any notable events or stories associated with the note or the individuals who signed it, it could further enhance its value.
4. Market Demand: The market demand for collectible banknotes also influences their value. If there is a high demand for 1928 $1 bills with the mentioned signatures and series, it can drive up the price. However, the market demand can fluctuate over time, so the value may not remain constant.
It's essential to consult with a reputable numismatic expert or a professional appraiser to obtain an accurate valuation of the banknote. They can examine the note in person, assess its condition, rarity, and historical significance, and provide a more informed estimate of its value.