First post for this, its a cartridge case plate and a music core button I believe...found this last early spring!! 10 to 12 inches under ground!! same size as a belt buckle...
I looked on EBay and found a button like this one --said it was a cw button if anyone can put a definite fix on this I would appreciate it. button and plate are from near corning NY .
Ok, it looked like a flat button in the first picture that's why I thought it was older. They can be hard to date without a back mark but someone may be able to give you an idea.
I have dreams of finding a plate like that. Not sure this old heart could take it. It skips a beat every time a three ringer falls out of the dirt for me. Congrats on some great finds.