You are right, it is something like that. I suppose it is an old model because I could not find anything similar. Walls are not parallel and there is no braking surface at all (a track rim ?). I got this wheelset from an ex-track rider in France. I don't know how and where he could get these Suntour Superbe hubs.

I find it pretty elegant on this Olmo, and it si absolutely super-extra-smooth (no word for it) compared to the bianchi pista I ride in NY. The only problem is that these wheels are stiff as hell and not very comfortable for a street use.