G'day Micky boy, This reference is a term used by vehicle restorers - it stands for 'New, Old Stock' - i.e. a genuine unused original spare part, rather than a reproduction/remanufacture.
Cheers, Gadge
"ODK Mods can explain it to you, but they can't understand it for you..."
"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."