Blackman began his senior career at Queens Park Rangers and in October 1935,[1] signed for Crystal Palace, then playing in the Football League Third Division South.[4] He made a goal-scoring debut in November in a home 5–0 win against Millwall and went on to make 27 appearances that season scoring 19 times.[5] Blackman made 29 appearances in each of the next two seasons scoring 12 and 16 goals respectively and 14 appearances (5 goals) in 1938–9.[6] Regular league football was then suspended due to World War II but Blackman went on to play Wartime League football for Palace up until 1946.[7] In May 1946, Blackman moved on to Guildford City and remained with the club for one season.[1] After retiring from football, he served as a trainer and physiotherapist at Millwall in the 1960s.[1]
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