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@crank
I think it's the LB as posted above.. will probably be threaded for a lockring.
The spoke holes on the drive side are strange though.. there are 10 slotted holes. It looks like you can feed the spokes head-first through the hole, then pull them into the slots to lock them. I guess its so you can replace borked spokes without removing the sprocket. Kinda clever. Only took another 70 years for a solution to that problem to appear again.