The picture below shows larger front and back views of this Old Metal Funk’s G Hybrid Corn Advertising Tie Tack Type Pin. The pin back section is included. Unfortunately we do not know much about this corn other then it was a very successful grown hybrid. The very detailed pin appears to be made of brass. It is marked on the arm holding the cob as follows:
FUNK’S G-HYBRID 304 BUSHEL CHALLENGER
The pin measures about 1/2'' x 1-1/2''. It appears to be in mint unused condition as pictured.