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I had a dusty old box full of "remnant" C9 chains that had come from doing gearing changes on customer's new bikes, and I eventually used them up on all kinds of bikes.
I added links as needed and even used them on a couple of old Varsities and Supersport models that had original steel one-piece cranksets (but with Shimano Uniglide freewheels). I never used Campag special pins with these, only KMC-type connecting links.
The chains wear well and gave no problems with shifting, while clearance at the front derailer cage became abundant so no need for trim, ever.
For best indexing performance, I usually use Shimano HG chain.
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