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?

elusive.

The absence of any attachment points was initially perplexing. However, this feature soon revealed itself to be a deliberate design choice. Unlike many agricultural tools that are mounted or affixed to larger equipment, this item was intended to be handheld.

In the fields, farmers often relied on portable tools that could be easily carried and used without the need for complex installation. This portability was key to its function, allowing the user to make necessary adjustments on the