B.H.P. maritime uniform button

“M. & S.”  ?Marks and Spencer

B.H.P. chartered vessels from 1915 and owned ships from around 1918. From 1939 it was building ships at its facility at Wyhalla. See  https://en.wikipedia.org/wiki/BHP_Shipping

The Newcastle Sun, (NSW), 27th April 1920 page 1.

State Library image H32040