small mud with unusual firing rest. the following is a quote form Jack Tod's book, page 18. "Specimens of U-11 have turned up which were fired by still another method. The insulators were glazed all-over and placed on a layer of refractory sand for firing, identical with the method formerly used by some companies in firing guy strain insulators. These U-11 specimens do not have any unglazed firing surface, and grains of sand are glaze- welded to the base rim". Picture two is of the base.