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There is no Southbend tag on it.
Should be a serial number stamped into the top of the bed at the right end. That will tell all.I had a 1934 405-Y "Workshop" model for more than 40 years. This one looks like a model 15 or 415 because it has the reverser for the lead screw. Mine did not. I needed to insert an extra gear to change the feed direction or to make left-handed threads.
Does the centre of those oilers press inward against a spring? If it does then push inward with the spout of an oilcan and give a squirt!
The serial number stamped in the bed is; 6445NCR8
The actual SN would be 64458Gene
In Steve Wells excellent website and database, if you look at the picture of 7148NCR8 you will see it looks identical to your lathe which puts it sometime around 1947.If you haven't already, you absolutely need to pull the spindle and replace the spindle wicks.
While you have the spindle pulled, you might want to install an auto serpentine belt. Those slippy leather belts quickly lose their appeal.
I have a similar motor on my 7" shaper, behind the round pressed in cover is a round felt wick that if I remember correctly rubs on the motor shaft. You will most likely need to dissemble the motor to refill the felt wicks. That is what I did anyway. Once full it will should last years.Dave