The cover bears the logo (WCS) or Wesley Cover Service and the address label is that of the cachetmaker, J.M. Gower.
I found this minor historical note pertaining to such covers:
Quote:
The founder of WCS was John Gower, who had an interesting history. Gower contracted polio in 1930 and was crippled from the waist down. This led him into a very active philatelic life. He began the "Kangaroo Correspondence and Exchange Club" in Adelaide in 1931.
John Gower opened the Post Office at Largs North, another Adelaide beach suburb on June 17, 1947. Therefore a vast number of earlier WCS FDC are cancelled at Largs North, starting with the September 1947 "Newcastle" trio.