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?

Worth
The value of a vintage seed dial can vary significantly based on its condition, rarity, and historical significance. While a common model might fetch modest sums, rarer examples from notable manufacturers or with unique features can be quite valuable.
For a two-dollar investment, the find could be worth anywhere from a few dollars to several hundred, particularly if it is in good condition and has historical relevance. Regardless of monetary value, the cultural and educational worth of such a tool is significant, offering a tangible connection to agricultural history.
10. Cleaning, Preserving, And Displaying A Brass Seed Dial
Proper care of a brass seed dial involves gentle cleaning to preserve its patina while removing any dirt or corrosion. A soft cloth and mild cleaner are often sufficient, avoiding abrasive materials that could damage the surface.
To display the dial, consider a stand that allows easy viewing of its features.