I believe at least 20 years since made here , Firestone had no licence to sell white walls here so all where exported to the states & then reimported apart from the ones we got out the back door , plus some had the whitewall paint black with instructions to mount that side in , Yeah right we soon learned how to take the black paint off,
My Tudor has five "Gum Dipped" New Zealand Firestone WW. They were put on the car in 1985. Each of the five tires loses one pound of air over the winter. They still have no cracks in them. If I could buy five more today I would.