I know the '69 Zs and 396/375s used a deep groove alternator pulley finished in silver colored zinc plating.

What alternator pulley did '69 SS 350s use ?
Was it a machined pulley ? and what color zinc plating did it have ?

Was is like the first pic (stamped) ?

Or like the Zs (second pic)

Are you looking to be factory correct or just worried about what will work? I have the machined pully (image on the right) on my 1968 with a CS130 alternator and it works fine.

I'm looking to be visually factory correct.
I have the correct silver zince plated fan to put on, but am wondering what's the correct pulley and nut on a 350 SS.