ACE 1923 1265cc 4 cylinder IOE frame # 4389 engine # B 6521 William Henderson created the fabulous ACE after he left the Excelsior Company in 1919. With growing discontent he had witnessed that the Excelsior engineers added more weight to the four between 1917, the year of the Henderson takeover, and 1919, without really working on better engine design or tuning. So he left and with financial backing of bicycle maker Max Sladkin he designed a faster, lighter and more graceful machine than the He ...