nygal,
Congrats on a nice rescue. You have there a Singer 99. I can't read the entire serial number but I can read enough to see that by the chart at ISMACS it's a 99, one of 15,000 allotted on April - 10 -1928.
http://www.ismacs.net/singer_sewing_...l-numbers.html
Go here to read about how to clean these older machines:
http://www.quiltingboard.com/vintage...v-t167789.html
Basically, use sewing machine oil and cotton balls or a soft cotton cloth to clean them. Chemicals, soaps, hand cleaners and things like break clean, acetone, will have a disastrous effect on the finish and decals.
Brush and blow the lint, fuzz, threads, and debris out of the machine then oil it. Oil everything that moves. If a hole isn't threaded, and doesn't have something in it, it's an oil hole. Oil 'em from top, bottom, under the face plate, through any holes in the back too.
The motor takes Singer grease ONLY. Don't use oil or Tri-Flow grease or Crisco or Vaseline, only Singer lube.
The 99s are an easy machine to work on and use.
They take Class 66 metal bobbins, but you can use the plastic Class 66 ones too.
They use 15x1 needles.
A really great source of parts and supplies for these old machines is Sew-Classic:
http://www.shop.sew-classic.com/
A super source of maintenance information is the TFSR site:
http://www.tfsr.org/publications/tec...machine_manual
I hope that helps. You got a good little machine there.
Joe