A Penfold Box

Looking for answers to a picture puzzle geocache today, I concluded that  Mother in a wheelchair is the ideal geocaching buddy. We wandered slowly round the Pantiles looking for clues high and low. Two pairs of eyes, the repeated circuits attracting no attention  The many street cafe customers probaby felt sorry for her as I pushed her round for a third time . 
The top of this post box was one of the clues.  A "Penfolds " hexagonal post box designed in 1866 by John Penfold; surveyor and architect.