Hi Savoia.
Reg is VH-TXT , a 206B II (1769). Operator is Jayrow Helicopters. It was exported to New Zealand in December 1983 as ZK-HXT. The machine in the background appears to be VH-BLP a 206B III (2441) which crashed after an LTE incident at Lake Eildon in Victoria in March 1983.
Hope Ths Helps