Yes, it is a Fenton Horse Medallion plate made around 1915. It is custard glass with a reddish brown decoration called nutmeg by some, but early Fenton catalogs called this "Peach Blo" (notice spelling). To my knowledge it has not been reproduced.
I had a plate like this once and I sold it, which I regret. If you put yours up for sale, please let me know.