When the Murray Battery site was used for the public works department new buildings, boundary stones marked B.O. were found. It was suggested that they stood for Board of Ordnance. The street lamps outside seven and six Penny Hill were also marked B.O. this appears to be the mark for all military property. "Like the V.R. of those days (now "G.R.")"
SCMP "Old HongKong" 1933