This exhibition was held to celebrate the 50 years of the Upper Hutt Stamp Club.
The exhibition was a Specialised National as approved by the New Zealand Philatelic Federation - http://www.nzpf.org.nz
As a fund raiser for the exhibition the society exhibition committee issued a series of Customised Advertising labels (CALS).
The first two were St Johns Church, Trentham and The Blockhouse - 70c face value each
The second two were Kereru (Wood Pigeon) & Tui - 70c face value each
October 2012 - http://www.apf.org.au/Prospectus-hutpex2013.pdf
http://www.nzpf.org.nz/exhibitions/results-national-exhibitions/upper-hutt-2013/