The Champion who literally had an iron chin.
Eugene Criqui whose jaw and part of his chin were shattered in WW1 by a snipers bullet. Surgeons rebuilt his face with iron and titanium.
After the war he resumed boxing. He won the French featherweight title in 1921 and the next year won the European Boxing Union featherweight championship. On June 2, 1923, he beat Johnny Kilbane by a sixth-round knockout in New York City to win the world featherweight title.
Had over 100 bouts with a reconstructed iron jaw and chin.