Circa 1900-1906 by the Greenfield Fruit Jar Co., Greenfield IN. Value $8-10 in quart, $10-15 in HG or pint. The line under Mason is referred to as a shepherd's crook.
Thanks for the info jarsnstuff ! I knew it was older than some of mine from the 40's - 60's, but no way to tell for sure. The fact that it cut me while handling it was a hint. It was from a house that hasn't been lived in during my lifetime, but playmates of my Dad lived there.