nostr:npub1cz8pvlt8unlcxwlllmx5esdz02ufefxakuna68aue2tq5ftfrzkqqkyjxv 
I thought horse chestnuts didn't have husks as spikey as this, but I might be wrong.  I looked at the tree's leaves, but foolishly didn't take a picture of them. My recollection is that they were simple leaves, not compound leaves like horse chestnuts.

My parents grew up in the mountains of North Carolina, and one of the local superstitions was that carrying a buckeye brought you luck. I often carried one in my pocket as a kid, more because it was pretty than for luck.