artifacks

I recovered these three portholes from the site of an old forgotten shipwreck on April 6th 2024. They consist of two seven-inch portholes and one five-inch porthole. All found resting in alignment with eachother from where the wreck disintegrated in place around them. They are all still operational.

I was less then 10 minutes into my first arrowhead hunt (No luck there.) and this caught my eye in the creek. Based on the shape and cut marks, I assume it is man-made. Can anyone verify this and provide any other information? I have tried to do research but I haven't found any Indian stone...