The orange KateeT is also marked Pat 175569 Reg. No., which is a British patent that dates to 1922. The Manhatten Tee is marked with the US patent date of June 28, 1915, but was actually made in the mid 1920s—it is also marked on its weighted base "The Reddy Tee. Makers of The Reddy Tee. The Tee of Champions."