These are imperfect Perfect Circle hubs as a cam is broken (see broken part in pic one). However, there are some useful photos of these Perfect Circle-branded 10-Spline Selectro Hubs.
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“Selling the used locking hubs in the pictures. These are aftermarket and called Perfect Circle. We don’t know much about these hubs. My husband said he removed these from a 1971 Jeep truck that was in a junkyard. He thought they were neat and brought them home. Of course they are the special 10 spline hubs. These appear to be complete, but the “cam” piece (#8 in the schematic) seems to be broken on at least one hub. Look closely at the pictures and determine if they are something you want. Maybe just a little eye candy for the bench area. These are being sold for parts or not working. Hopefully there are enough good parts here to allow someone to complete their project. These are very clean and ready for a new owner.”
Lower left part is broken.
As you can see, the Dualmatic schematic is similar to the Perfect Circle Schematic, though, surprisingly, the casting of the base is slightly different. I’m betting the cams are the same though.
More pics of the Perfect Circle hubs.
