I have a 9-11-13 manufactured 9cy that I would like to give a good cleaning and go over one of these days.
9C 's were manufactured starting in 1939. Are you sure the 13 isn't a 43? The south Bend website shows first production of 9 inch lathes (the junior variety) in 1914.
Just curious. A serial number would confirm it. It is located at the far right end of the bed next to the fastening screws (see photo).
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Here is the link to the SB Lathe Serial Number Page. Grizzly is the official Dealer for SB Lathes.
http://www.vintagemachinery.org/mfgindex/detail.aspx?id=1617&tab=5
They will even send you the manufacturing data card for your lathe for a fee. (see Photo)
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This lathe was delivered to one of my former employers in 1940. If memory serves me, it is still in use!