Unknown Cason family photograph

The writing on this photograph says:-
W. H. Hammer St Austell.
St Austell is in Cornwall England. No other identifying features.

This photograph was handed down through the Cason family. Could also be the Robb family originally from Dysart Fifeshire Scotland. I dont have any ancestors (so far!) from Cornwall so this one is truly a mystery. My Cason ancestor came from Ipswich Suffolk England so could be connected there somehow. He came to Victoria Australia to live in the 1850's.