It is indeed the shamrock on the nosewheel undercarriage door of Vickers V807 Viscount ZK-BRF (c/n 283) as seen at the Ferrymead Museum in Christchurch.
For an earlier view of this aircraft check out :-
Now if this was a more recent photograph you would be excused for noticing a very large crack down the concrete wall behind BRF from the recent series of earthquakes.