Actually, Kalamaquilts didn't go far enough (maybe left out a digit?). The "G" serial numbers sometimes doesn't have the correct model, but usually is correct if you get all the digits. It appears that it is probably a 127 whose serial number was allotted February 1, 1916.
Did you get a manual and some attachments with it? Yes, we do like pictures and can confirm that it is a 127.
Here are a few threads, here on QB, about the 127.
What you can buy at Habitat for $45.
Singer 127
G2902752 Singer treadle
Treadles are fun, once you get the hang of it. Just play with it for a bit.
Janey - Neat people never make the exciting discoveries I do.