Welcome to the forum , StreetScene .
Thanks for posting your cool little item .
Kinda looks to me as if the tops of the letters U.N.'D.' were stamped in an arch ....
Looks alot more like the letters " U.N.O. " to me ... (who happened to be a manufacturer/supplier of metal polishes ) .
If it's a competition prize , these were most always plated with silver or gold &/or cast in solid bronze and other & etc metals .
Sure be worth checking all of it's pieces with a strong magnet , too .