Very nice single cast iron four fold door knob with a two piece neck.  Not sure I have seen one like this before.  It does not come apart but it is clearly a two piece neck on the knob. Circa 1880's.  Blumin Catalog reference number of H-11200 by Corbin Hardware.      

Showing very little wear.   Have not cleaned it.  

The knob has a 2 1/4" diameter and a height of 2".    

Great addition to any collection.  Would give a nice period look to any door!

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