Kitzone,
Your illustrations have caused me to pause and think a bit.
My machine number is G07????? (don't have it here to reference, but it is 7 digits long after the letter G).
When I went to Singer, I began at the beginning and looked for G-7????? and skipped over the digit 0 (not the letter O).
That made my machine a model 27 made in 1910.
Your illustration for a 27 and 127 show different shuttle carriers.
My carrier is like your 127.
DO NOT skip the 0! (this is not the letter O)
I went back to Singer and found G-0?????? at the far end of the list (where I had not gone) after the G-9999999.
So my machine IS a G-07?????, which makes it a 127 or a 128
made in 1924.
This is sad, because I was planning a hundred year celebration this fall for Granny's machine. Now I have to wait 14 years.
Ah well, at least now I will have the right model to replace parts.
Thanks for the eye opener.