1. Condition: The overall condition of the bill is crucial in determining its value. A bill in uncirculated or near-perfect condition is more valuable than a worn-out or damaged one.
2. Rarity: The J series of 1928 $50 bills is not particularly rare compared to other series of the same year. However, certain variants or errors within the J series might make a bill more valuable to collectors.
3. Serial Numbers: Bills with unique or desirable serial numbers, such as low serial numbers, repeating digits, or fancy serial numbers, can command higher premiums.
4. Signatures: The signatures of the Treasury Secretary and the Federal Reserve Bank President on the bill can also contribute to its value, especially if they are notable figures or have historical significance.
5. Historical Significance: The 1928 $50 bill was issued during the early years of the Great Depression, making it a significant piece of American history. Bills from this period might hold additional value due to their historical context.
6. Market Demand: The overall demand for 1928 $50 bills and similar collectibles can impact their value. If there is a high demand for these bills among collectors, their prices may rise.
It's important to note that the actual value of a particular 1928 $50 bill J series can only be determined by an expert numismatist or through reputable coin and currency auctions. If you possess such a bill and are interested in its value, consider seeking professional advice before making any decisions about selling or collecting.