Bought a set of OEM spark plugs for my G37 from Z1, installed it today but noticed the new spark plugs did not say IRIDIUM on it. Is this normal?

Car runs fine and plenty of power, no codes or anything.

The old spark plugs have the Iridium naming on them.

Part number: FXE24HR11 22401-JK01D.

Maybe I'm being paranoid.

 

Denso? The packaging should say (mine did) iridium long life.

 

I'm talking about on the spark plug itself, the old spark plug has the word Iridium on it, the new one does not.

It's the same part number.