How much is a uncirculated 1937 penny with 13 stars and a key and a scale and a big D on the back?

The value of an uncirculated 1937 penny, particularly one with unique features like 13 stars, a key, a scale, and a large "D" mint mark, can vary significantly based on its condition and collector demand. Generally, such coins can range from a few hundred to several thousand dollars, depending on their rarity and market trends. For an accurate appraisal, it's best to consult a reputable coin dealer or use a coin grading service.