What is the age and valuej. Stevens 821?

The Stevens 821 is a model of shotgun produced by J. Stevens Arms Company, primarily in the early to mid-20th century. Its age can vary depending on the specific production year, but it generally dates back to the 1930s through the 1960s. The value of a Stevens 821 can range widely, typically between $150 to $400, depending on its condition, rarity, and any historical significance. For an accurate appraisal, it's best to consult a firearms expert or check recent auction results.