Hi Dob,
According to Malcolm Thomas and Cliff Lord's books, New Zealand Army Distinguishing Patches 1911-1991:
Your patch dates from 31 January 1974 when New Zealand Force South East Asia (NZFORSEA) was a Singapore based tri-service military Force.
Also worn by New Zealand Defence Support Unit (South East Asia) formed 1 October 1989 in Singapore.
And also worn by other NZ peacekeeping forces since.
Cheers, Tinto
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