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?

agricultural developments.

Determining the completeness and originality of a seed dial involves examining several key features. The presence of all numbered notches and a smoothly rotating top plate is essential.

Originality can often be confirmed by looking for maker’s marks or engravings, which are common on vintage tools. Wear and patina consistent with age can also indicate authenticity, as can the quality of the brass used in its construction.