I would say you have some type of Taper-Lock bushing/sprocket, perhaps even home-made or blacksmith shop-made.
Taper-Lock sprockets are commonly used on industrial machinery and not farm machinery 'cause they cost more than a cheap farm machinery sprocket, but have the advantage of being able to adapt to/grip a worn shaft to keep a machine operating.
Looks that's just what a P.O. tried to do, as I doubt that sprocket and hub are OEM.
Typically, there would be three screws used, and two more threaded holes to force the sprocket and hub apart when disassembly is needed.
Here's a photo of one such setup, GOOGLE Taper-Lock sprocket for more examples.
If your sprocket is made like in a typical fashion and all the screws have been removed the sprocket should come off of the hub by whacking it towards the gearbox.
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