These Helicomatic hubs have a twisted spline pattern for the freewheel to slide on to. The splined barrel spins with the wheel, while the gear cluster has the ratcheting mechanism inside. You can see how skinny that barrel is compared to the axle, it must have some pretty small ball bearings inside. Here is what the matching freewheel and lockring look like:
That lockring keeps the freewheel on the hub. You're supposed to use a special tool to screw it on, but this one came off on its own and all I had were some pliers (they worked fine).
The advantage is that you can remove this freewheel on the road without a big wrench or table vise, but the bearings inside the hub might wear out sooner because they're so small. This wheel also has a crazy amount of spoke dishing, with the drive side spokes nearly vertical with the rim.
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