Whieldon Ware Pheasant Pitcher F. Winkle early 1900's

Whieldon Ware F. Winkle Pheasant Pattern pitcher. This beautiful pitcher is 4 1/4 inches high an 5 inches in diameter at the middle. My research indicates it is circa 1908-1925 according to the markings on the bottom. T is a marking which looks like a question mark that I am unsure as to what it is. T are no chips or cracks - only signs of wear. The gold is worn in one small place at the spout. The colors of the pheasanat and roses are bright and clear. This was my mother-in-law's piece.