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@dbr
The hub could be anything, as Super Champion is the model of rim. It's a pretty old road rim, so I suspect the hub is just a standard old school screw-on-free-wheel type, which would mean it has no lock ring thread.
If there are two threads, one large, closest to the spokes, and one slightly smaller, reverse thread on the outside, you're in business. If there is only one thread, you can only really go single speed.
You can put a single cog on it, but you won't be able to secure it properly. Some people use lock-tight but it's not a great idea.