« Last post by Camarocards on May 23, 2016, 06:22:36 PM »
could the big letters indicate the 'date' that the entire cluster was assembled?
The big letters (NN) indicate the broadcast code. Although you might not be able to see it on your decal, each decal is date stamped. The picture below is what I found on my '68 cluster assembly.
What is interesting about your tag is the color. I've never seen a purple one before.