Just when you think you know all of your cars birthmarks....I'm glad this thread started!
The one on eBay looks very different (if it's the one being sold by 396-325). But if that is what '69 looks like then that explains it.
I looked at my original 67 and a NOS one I bought around 1982 and they both have AAc stamped.
The original 67 stamp is on the middle back and the NOS is on the front lower right (facing the bracket).
As a side note, the original was flow coated with a few large drip marks.
Notice how the 'c' is smaller than 'AA'. The 69 fonts on eBay look the same.