This is an obsolete (and elusive) NOS Ford Motorcraft RS-64 radiator cap for 1986-1995 Ford Mustang and 1986 Mercury Capri with 5.0L engine and 1986 Mustang SVO.
An absolute MUST-HAVE for your restoration as the current Ford/Motorcraft replacement cap looks nothing like this original.
Remember... Reproduction parts have no collector value.
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