How can you tell if EQ Heads are from New Zealand Foundry

I think @RAMM is looking for a set of these heads, so if you choose to go another way, maybe you could pass along the info to him if your friend is selling.
Feel free to pm me if you want to compare the external appearance further with mine, but if he bought these back in 2018 or before, they should be the good version. Somewhere after that they changed, maybe in 2019.