Barry Lumb made his début for Wakefield Trinity during March 1973, and he played his last match for Wakefield Trinity during the 1975–76 season, he appears to have scored no drop-goals (or field-goals as they are currently known in Australasia), but prior to the 1974–75 season all goals, whether; conversions, penalties, or drop-goals, scored 2-points, consequently prior to this date drop-goals were often not explicitly documented, therefore '0' drop-goals may indicate drop-goals not recorded, rather than no drop-goals scored.
References
^Mike Rylance (22 August 2013). "Trinity: A History of the Wakefield Rugby League Football Club 1872-2013". League Publications Ltd. ISBN978-1901347289