I would say they are the ANCO type as you can see clearly see in JOEL picsCorrection, upon closer examination of the parts book, there were 3 different wiper arms available for the '69 Coronet coupe and hardtop models.
The generic - 2822999
ANCO type - 2889860-1
TRICO type - 2983086-7
So if anyone can show what these three variations look like, that may clear up the whole issue.
Here is a bunch of patent numbers on the blade assembly if that can help anyone solve the mystery.
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