This is Made in New Zealand and I think the Fieldmaster is a Tractor Tyre. The glass insert is in good condition with no chips and is unusual in that it advertises "Balanced RELIANCE Recaps" so I can only deduce that this is/was the retread arm of Dunlop's.
The rubber tyre does have quite a few small burn / scorch marks but no actual holes. Diameter 5 3/4 inches.
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