Collar badge of a soldier in the NZFA in 1918

From Matt TURNER:

Hi, I am researching portraits of WW1 servicemen for a forthcoming book to b published by Te Papa Press in Wellington. I would like to identify the collar badge of a soldier in the NZFA in 1918.  The soldier, Eric Graham, was promoted to Temp. Bombardier in late 1918 but I'm not sure exactly when this pic was taken; identifying the badges will help. Could you very kindly assist? With thanks, Matt Turner.  My email:  shedpub@gmail.com .