I hope you aren’t the seller, 600 isn’t dura ace…
They are dura ace but shimano bought them and sold them. Put the code FC-6400 into google and see what comes up. There an 80’s model
Shimano 600 is the old version of Ultegra, not Dura Ace. Dura Ace cranks of that era would be FC-7400. What are you smoking?
I’m guessing it was a combination of things :roll:
crack is what he’s smoking