I found this ring among my grandfather's things. (He would be in his late 90s, I think.) I tried to do a reverse image search on it, but could not identify it's origin. There are many eagles on the sides of WW2 rings (that came back in the reverse image search).
On the inside, you can faintly make out the word "STERLING", or something very similar. On the top of the front, I see a partial word, "FIELD".
Is this a WW2 ring? If so, is it any ring in particular? If not, what is it?