I may be able to help...Singer has a whole line of industrial machines...Straight stitch mostly...new ones start at about $700. They last forever with a little maintenence. If you try to tip the machine head towards the back of the machine, it may be sitting in a bed of oil. This is for lubricating the machine as it will work for 12 hours straight without stopping. It needs special needles(not the same as your home sewing machine needle), a special sewing machine oil that is sold by the quart and has a leather belt to run the machine/motor.
The model # is listed on the machine somewhere usually 3 #'s, a letter, a -, and then another 3 numbers.
Contact Singer for an instruction book once you have that info...
Good luck, Susie