For 1918 it is one of the easy ones. John Henry won it with an Ithaca Flues SBT. It is in many of the Ithaca catalogues from at least 1925 to 1953 that he won with an Ithaca and it is stated in the 1925 Ithaca catalogue that it was borrowed. Ithaca SBTs won at least 11 times that I've found, 1917, 1918, 1925, 1926, 1929, 1932, 1934, 1937, 1939, 1942 and 1945.