1. Condition: The condition of the coin is one of the most important factors in determining its value. A coin that is in good condition, with minimal scratches or wear, will be more valuable than a worn or damaged coin.
2. Mintage: The mintage of a coin refers to the number of pieces that were minted in a particular year. Coins with lower mintages are generally more valuable than those with higher mintages. The 1937 half dollar had a mintage of 1,541,000, which is relatively low compared to other years.
3. Rarity: Some 1937 half dollars are considered to be rare, which can increase their value. One rare variety of the 1937 half dollar is known as the "Buffalo Nickel Reverse," which features the design of the Buffalo nickel on the reverse side instead of the usual eagle design. These rare coins can be worth significantly more than regular 1937 half dollars.
Based on these factors, the value of a 1937 50 cent piece can range from a few dollars for a well-worn common coin to several hundred dollars or even more for a rare coin in excellent condition. To determine the exact value of a specific 1937 half dollar, it is recommended to consult a professional numismatist (coin expert) or refer to reputable coin price guides for current market values.