Has a central moulded relief of an insulator. Edge reads, "N.Z. Insulators LTD Neeco Temuka New Zealand".

Printed backstamp, "Neeco Temuka Ware".

I've seen several of these turn up on TradeMe.co.nz but this online auction site only allows people from New Zealand, Auckland and Australia to register and bid on the site.

(Around the rim) NZ INSULATORS / ASHBURTON / TEMUKA

(Center in oval) NZI