That's a nice science fair brass or bronze achievement doohickey. From the look and patina I estimate North American, mid to late 20th century, with a nod to the 'applying science to agriculture' theme as a possible representation.
Maybe for third place, but I just a joke make, no?
Handle it gently, it is the only one like that in the world, making it unique.
Don't clean it.
Worth maybe $1 to $20?
Edited by Parklane64
11/23/2015 6:55 pm