Dahlberg was born on 12 April 1931 in
Surahammar, Sweden. He grew up as childhood friends with
Ronald Pettersson, who also played hockey and was eventually inducted into the
Hockey Hall of Fame. He played for
Surahammars IF in the then-highest Swedish league
Hockeyettan before making his
Sweden national ice hockey team debut in 1954. He made his international debut at the
1962 Ice Hockey World Championships. Although it was originally agreed upon that both Dahlberg and Batja would officiate, the Soviets backed out of the agreement after Dahlberg was diagnosed with the flu. As a compromise,
Josef Kompalla and Batja officiated the match, which ended with Canada winning the title. Besides refereeing ice hockey matches, Dahlberg also officiated soccer matches, including the qualifying rounds for the
FIFA World Cup. He was inducted posthumously into the
IIHF Hall of Fame in 2004, and into the
Swedish Hockey Hall of Fame in 2012. ==Career statistics==