Hi,
I have recently purchased a mid-80s Colnago, it has super record transmission, and the chain is on the way out. It has a 7 speed cluster, which I assume is not original, and I'm thinking of replacing with a 6 speed, as the offset seems wrong too.

My question is what chain is recommended? Do I have to get a campy one? What brands are recommended? I see 11 speed chains, does that mean you can get 11 speed clusters? Yikes! I used to race, however I have a 30 year gap in my knowledge of bikes, but I'm back on the saddle and loving it!

Cheers!