I bought the original made in New Zealand heads back in 2016, now they are made in China I guess. The made in NZ heads ends are significantly different from the China versions, the chambers of the NZ heads casting has a finer vs coarser finish, the color of the as cast iron is different as well. Among other things. The NZ head was a high quality finished piece.
NZ chamber texture:
View attachment 1715854784
Look at the single flat surface of the ends of the heads, no core plugs:
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The latest version with core plugs and very heart shaped chamber, more pronounced than the NZ chamber:
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