cyccommute 

At this point in time, I’d assume that all chains are peened. You might find some cheap chains like the old style but those would certainly be limited to anything for use on 5 and 6 speeds. One way to tell is to be observant during pin removal. If the pin takes a lot of force to remove and (or) makes a “snap” sound when it finally begins to push out, the pin is peened.

But, frankly, using a quick link on any chain is just easier. It’s simple, works well, is strong, and doesn’t require all the fiddling of pushing a pin back in.