Isn't she a beauty? The serial number dates her to 1928, and the ornate decals sure fit the Flapper era. Beautiful cabinet too, although the top will need some TLC.
This link to ISMACS show a machine that is definitely a cousin of mine, with some nice clear threading diagrams. http://ismacs.net/singer_sewing_machine_company/singer-class-127-sewing-machines.html
This is a vibrating shuttle machine, it has that bullet shaped shuttle with the bobbin that looks like a little bar, rather than a round bobbin. I found the VS intimidating for a long time, because it looked so different that a round bobbin. But once I got my Davis NVF I had to get over it, and I got over it quickly. Basically, it's a bobbin. You wind it on the machine. Then you have to hold it with the thread coming off a certain way and you put it in the shuttle, put the shuttle in the machine. You close the cover plate and you sew. No real learning curve, it's just a different way of holding the bottom thread to create a lockstitch with the top thread.
Treadle On has some great info that helped me get over the nerves of the new system:
http://www.treadleon.net/sewingmachineshop/shuttle/vsshuttle.html and if you get a vibrating shuttle machine it is really fun to watch the bobbin wind, it's a pretty ingenious mechanism with the guide going back and forth distributing the thread as you treadle. There are some great videos of the process on Youtube also.
Here is a link to a manual, it is a color scan of an original http://ismacs.net/singer_sewing_machine_company/manuals/127-128.pdf
This one is a bit easier to read
Can't wait to get a belt on her.