Those are "Span" mags, made by Dave Wallace in Onehunga. I still have the Coppins Wheels and yes they are the same as the Dawson wheels. Fronts are 15 x 10 and the rears were 15 x 14. Apart from very light weight F 5000 type wheels there wasn't a lot else available in those sizes, though Croyden Thompson was also making wheels in Otahuhu, and one big sizes too. I believe they were cast at the NZ Railways workshops near by.
B.





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