Momberg was interested in
amateur wrestling as a youth. At the age of 16, he went to
Canada and was involved in many sports,
rowing and participating in amateur wrestling at the Hamilton Jewish Centre and in the local
YMCA. He made his debut as a professional wrestler in 1957 as "The Flying Dutchman" Dutch Momberg, On June 10, 1972, Krupp defeated
Leo Burke for the
ESA's
IW North American Heavyweight Championship. Early the next year he went to
Japan, where he had many of his early successes, co-holding the
NWA International Tag Team Championship twice between February and April 1973 (once with
Johnny Valentine and once each with fellow 'evil Germans',
Fritz Von Erich and replacement partner
Karl von Steiger). He also reached the final rounds of the 1974 and 1975
New Japan Pro-Wrestling World League Tournaments, both of which he lost to
Antonio Inoki. Krupp and Von Erich worked as the "Iron Claw Masters" in Japan. He returned before long, however, to
Atlantic Canada for a memorable run in
Atlantic Grand Prix Wrestling. In the mid-1980s, near the end of his career, he feuded with
Angelo Mosca around southern
Ontario. By the end of March 1983, he began wrestling in the
Dallas Texas-based territory for Fritz Von Erich's
World Class Championship Wrestling. In July 1987, Krupp wrestled his last recorded match before retiring in 1988. ==Later life==