I never can remember the difference between the 27 and 28 and the 127 and 128. There is a great website to help us identify our older model Singer: www.sandman-collectibles.com/id-singer-machines.htm This, as it turns out, is a 128. The 127 is the full size version of this 3/4 size machine. The difference between the 27/28 and the 127/128 is the position of the bobbin winder. The 27/28 has the bobbin winder low, near the bed of the machine. The 127/128 has the bobbin winder high, as in this example. I have a Fiddle Bed with these same decals, further emphasizing that decals do not denote anything but decoration.
I used Dr.Bronner's almond oil castile soap for this clean up. Then I rinsed with sewing machine oil and rubbed gently but for a very long time. I hate to put the bobbin winder back on. This is the prettiest part of the machine. I'll bet the bobbin winder protected it.
If I could mount the bobbin winder low, I would. I don't think that I can.