The cache is not at the posted coordinates.
I love mermaids, so making a geoart as a mermaid tail sounded like a perfect idea to me. I went to a few of my mermaid friends with the idea, and they loved it. Some of them were even willing to let me name some after them. So this first one is for my very close mermaid friend Mermaid Marina.
To get the coordinates, you just need to answer the following question. When was the last year the half penny was minted in America?
1900 (N 41° 11.608 W 088° 28.608)
1875 (N 41° 11.554 W 088° 29.111)
1857 (N 41° 11.755 W 088° 29.208)
1850 (N 41° 11.751 W 088° 29.004)