There are no dates or makers marks, the only clue to it's owner are the initials in the collar. I mounted the ribbons on a piece of card and stitched them back on using period thread as when i bought this there were stitch holes for the ribbons. This is the type typically seen in late WW1 in Palestine and other tropical theatres as per the period photo in the listing. A large size too, chest size about 42.
The item "WW1 ANZAC New Zealand Officers Tropical Tunic" is in sale since Saturday, October 2, 2021. This item is in the category "Collectables\Militaria\1914 - 1918 (WWI)". The seller is "hauptsturm" and is located in Colonel Light Gardens, SA.This item can be shipped worldwide.