Bluish Green folk pottery

This piece is a bluish/green or turquoise. It measures approximately 5 inches tall and 5-6 inches in diameter. It is another one of folksy pieces. I also believe this to be an old piece. I do not necessary have extensive knowledge of pottery; only that I know what I like and this along with 4 others fell into my country pots collection. If anyone has an idea of the possible age and/or origin of this piece. That would help me appreciate a little more. I am thinking possible an American maker.