Gold ring found metal detecting, can anyone pinpoint age or origin?

I found this ring about 5 inches underground in the woods (in the US). There are no karat markings, but I acid tested it on a scratching stone. The highest acid I have is 22k and it was not eaten away, so I’m guessing it’s either 23k or 24k gold. The markings that are there, are on the outside of the band and are not familiar to me. Very curious if anyone here has any theories as to how old this ring is or where it might be from!