Source: Boxing News 26 April 1957 p10, "Round The Commonwealth" results.
Nigerian lightweight title:
Quintin Pitt (Lagos, holder) W RSF 8 Amory Okposio (Pitt ID# 951986, Okposio ID# 614849)
Note - not clear if this was part of event 642810 or a different event. Therefore suggest recording this as a different event.