Bob shared the photo at the bottom that appeared on a Craigslist Ad for a 1977-J10. It shows what appears to be a Cutlas hub, but it’s a design I don’t have documented. Let’s review the Cutlas Selective Drive Hubs:
The first design was model 100-2 and had no slot:
Later, Cutlas came out with the slotted form of the hub. Note that the slated knob has a “506-1” part number, suggesting that this whole hub was model 500-1.
Arguably, the Bulldog was the next iteration of this general design. It too has the slotted knob, but lacks a model number:
The hub Bob spotted was on a later model jeep, so maybe Cutlas offered this version of the hub for a short time? It seems to be an further iteration of the Bulldog; unfortunately, I have no brochures that document it.