That year, Manly finished second on the table and made the finals for the first time in their history.
Manly went on to reach the 1951 NSWRL grand final against South Sydney.
Lumsden finished the season as the club's second highest try scorer for the year.
Lumsden capped off the year after being selected to play for Australia in one test against New Zealand.
Lumsden played on with Manly in 1952 but the club missed out on the finals.