I thought the biggest difference on a 27 and 127 is the 127 has the cast-in motor mount boss and wheel operated bobbin winder. That would explain the different bobbin winders between my 27s and crocee's. My understanding is the 28s and 128s are the 3/4 size machines.
Rodney

EDIT: I really need to read ALL the posts before answering...

I have an old 127 that has been refurbished. I don't love that machine at all. They ground off the mount for the bobbin winder and put one on the belt guard. It will only run on a very small hand wheel - I have a hard time turning it.

27 / 127 = Full size
28 / 128 = 3/4 size

By the bed dimensions it's a full sized machine.

Joe

No, I meant that you must have looked it up in the six digit serial numbers instead of getting further down to the seven digit numbers. You really have to watch that, I've made that mistake more than once. Of course, there are a few of the records that have mistakes in them, I've run into that also. But in this case it was a matter of the right number of digits. I can't tell the difference between the 27/127-28/128s, but I knew it wasn't a 66.

Cari

That could be true Cari, I just took for granted that there was only one set of G numbers. Never even thought to count the number of digits.

Now this is totally weird. How often do you by a fluke pick up a sewing machine you know absolutely nothing about that has a manufacture allotting date the same as your birthday (well a whole bunch of years before I was thought of). This is so cool. This machine was allotted Sept 20 1917 and only 25000 machines. Its a lot but still better than 50000.

Now to give you an idea of just how prolific Singer manufacturing was back then, for the year 1917 alone, Singer had 7 runs of 127s for a total of 175,000 for that year and that model alone. Wow.

Cari

That's a lot of machines and to think they were all made pretty much by hand, no robots.

And they are so much better made than what you can buy in the store...

I sure don't have all the answers - I think it is very confusing.