DescriptionKeystone Dairy Co., Hoboken, N.J. One quart milk bottle. No date, circa 1923-1940s. Clear mold blown glass, 3-3/4" diameter x 9-1/2" high; embossed lettering front, back and bottom. Made by Thatcher Glass Manufacturing Co., either Kane, PA or Wharton, N.J. Front: Keystone Dairy Co. Hoboken, N.J. Registered M T C [maker's mark: Thatcher Glass Manufacturing Co.; large 'T' with smaller 'M' and 'C' nested below 'T' cross; this mark used circa 1923 to 1950] Back: [large keystone outline shape with outlined 'K' in center] One Quart Liquid Bottom: Large 'K' with a 3/4" circle over center with 'E' inside 27 (milk cap, 1-5/8" diameter, is not present.)