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N.O.S. or New Old Stock: Never Used
N.O.S stands for “New Old Stock,” which describes a part or component they produced back in the day, but never used. N.O.S. parts are still in their original packaging and they never opened or messed with them. Collectors are willing to pay top prices for such items since they deliver more originality to their restorations.
Beware, though, because some N.O.S. parts like rubber hoses or weather-stripping kits are not safe to use since the materials have probably deteriorated over time. In some cases, you want newer parts for your restomod.