I think 100% of them will have the fuel tank painted black. When there were a lot of Yanmars on Ebay this was a good first-glance indicator.
The OEM radiator hose has an outer braid. I've seen rebuilts with the top hose wrapped with electrical tape then painted to a glossy finish.
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I have an old 1500D that is really uh, aged, paint is sun-baked to a very rough flat red with old dried, wrinkled Yanmar 1500D decals along with originally a black fuel tank. I just recently replaced the old fossilized OEM braided/taped hoses and the pin-holed tank with an opaque white one. The owner I purchased it from 6 months ago had owned it for the last 10 years after purchasing it from a Sacramento farmer who had it for several years. If this is a VN rebuild, I will gladly take another one please, this thing runs and operates like a new tractor, this thing is really mechanically very tight, just left outside for the last 12 or 15 years. This tractor has been here (USA) for at least 12 years, maybe more, was there a VN recon market back then?
I think your VN "signs" are not too reliable as I would be surprised if this one is a VN recon, considering its long USA history.
If anything IMHO I think the taped, braided hoses are Yanmar OEM and a sign the tractor has possibly NOT been rebuilt or at least re-hosed. And anybody can rattle can a tank black.