Dave, the first Taylor J-2 Cubs (ZK-AFQ and ZK-AGD) arrived in 1938 - Barnard Owen, the Christchurch chemist, was the agent.
Peter, you wouldn't happen to have an ownership chain/history for AGD by any chance? Mine's missing some dates and I'm unsure if it's complete:
Airworthy. To ZK-AGD with JR Franklin, Wanganui 01/1938, used by Wanganui Aero Club. To H W (Bert) Lightband, New Plymouth. To Peter G Hobart, New Plymouth. To CJL Dundon, Wanganui, wfu 1958, damaged by hangar collapse 10/04/1968. To Murray Farr, Hawera and stored for rebuild, cancelled 17/12/1990. To Kip Netherclift and Murray Kirkus 2011, restored to airworthy, to ZK-AGD 04/03/2014, withdrawn 24/06/2014, to ZK-AGD with Netherclift AGD Partnership, Napier 17/09/2015, f/f 09/02/2017. To Ron J Day, Otane 25/06/2020, ferried to new base Waipukurau 28/06/2020.