That is a heck of a find!
Don't let the forest service see these types of things if you find them. A ranger stopped my 11 year old and I the other day for no reason on our way out of our claim. She asked him directly (not me) if he found any relics besides gold. Fortunately he said no. She then told us that if we had removed anything older than 50 years she would have to write us a citation. I could not believe she asked him the question and not me. Luckily the only targets we dug were 3 dinks and 2 buckshot.