1. Star Notes: Star notes are distinct because they have a replacement letter instead of a Federal Reserve letter in their serial numbers. In the US, they were mostly issued as replacements.
2. Rarity: Star notes can be seen as somewhat more scarce than regular banknotes, but they are not extremely rare. Their availability in the market also affects their value.
3. Condition: The overall condition of the bill plays a significant role in determining its worth. A well-preserved 1974 $100 star note with crispness, no bends, or tears, can hold a higher value.
4. Signature Combination: The combination of signatures is noteworthy. Certain signature combinations on bills can make them more desirable to collectors, affecting their value.
5. Demand and Supply: Ultimately, the value of such collectible banknotes depends on their market demand and supply. Collectors may be willing to pay more for specific note combinations, serial numbers, or star notes from certain series or years.
Considering all these factors, it's advisable to consult with reputable coin and currency dealers, appraisal specialists, or visit platforms that specialize in currency collecting to get a precise valuation of the 1974 hundred-dollar bill with a star note.