Can anyone help ID this spindle?


bryan stewart
 

I am in the process of rebuildingĀ  a heavy 10 headstock, so I bought this spindle on EBay and it was listed as a Southbend heavy 10L spindle.

Looking at pics online the heavy 10 I'm not seeing the fine threads on the back of the spindle.

Anybody have any idea what this is off?

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