Picked this up at a muddy March flea market for two dollars. It has numbered notches and a rotating top plate, but no obvious way to attach it to anything. What is this thing?

fly, directly in the field where conditions could vary significantly.

The mystery item was identified as a vintage brass seed dial, a tool once essential to the practice of precision farming. These dials were used to calibrate seed planters, ensuring that seeds were dispensed at the correct rate and depth.

Seed dials played a critical role in maximizing crop yields by allowing for the careful control of seed distribution. By adjusting the dial to align with specific notches, farmers could calibrate their equipment to suit different types of seeds and planting conditions.

Farmers would use seed dials by aligning the rotating plate with the numbered notches, which corresponded to various seed sizes and planting depths. This simple yet effective mechanism allowed for quick adjustments in the field.

Once set, the dial would guide the