The following was provided to me by someone (The Author) who is more knowledgeable than I with regard to the South Bend lathes [I hope the photo uploads].
This lathe is what the Author refers to as a Heavy 9 or a 9L. It is a 1 Inch collet lathe and it the side oiling ports on the headstock - capillary oiling system.
There were not many made before they ended production in favor of the 10L or Heavy 10.
Your ship date of 8/21/1939 is just before the date I found in a South Bend internal document
stating the approximate end of production of the 9L spindle was 9/14/1939. I would think your
lathe is one of the last one built. Also it's ship date is after the introduction of the Heavy 10.
I've been told they used the same spindle in the 10L, and the spindle specs do match.
We have never found what we consider the S series headstock with the side oilers on a 9L,
which all 10L's had.
I sent scanned images of the serial cards to the Author and he provided the following information:
I can explain all the numbers for you.
The first one that is very interesting is the headstock number: 102
These are design and change numbers. 100 is the original design. Any revision
to the unit gets added to this base number. Your headstock design has had 2 revisions
to the original design, therefore its a 102 "Unit Code". This is how South Bend kept track
of the parts that were used on the build of each lathe by serial number.
I am hoping that the 102 headstock revision is "the" side oiling S series 9L.
After sending the Author photos of my lathe, I received the following reply:
This is a true Heavy 9L.
I posted a photo and the serial card in the serial number database [
]404 Error - Page Not Found. Photos of the serial card can be viewed here as well]].
This is only about the 4th one I heard about and 2nd with photos showing the headstock.
One rare lathe indeed. Made for approximately 1 year.