He examined this badge at the Mansfield Ohio Civil War Show in 2006. Not sure why this badge is a four leaf clover?
I suppose it could represent the 18th Corps? It has been in my collection for 15 years. The item "Civil War Badge Captain C. Roys 117 Regt NY Vols" is in sale since Sunday, June 23, 2019.
This item is in the category "Collectibles\Militaria\Civil War (1861-65)\Original Period Items\Other Civil War Original Items". The seller is "armyvett" and is located in Wadsworth, Ohio. This item can be shipped to United States.