Little Dozer

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I’m still not sure how old this is – it could be 1950’s, or it could be 1990’s or even newer? I’m usually quite good at guessing with machines, but this has me stumped.
It’s being used to create a new farm-driveway, which makes me think it’s new, as companies in the business of construction don’t mess around with old machines and their breakdowns.
BUT, the farmer may be creating it themself, and New Zealand farmers DO keep machinery going *forever*, especially something like this which they may only take out of the shed once every couple of years…