Welcome, but Joe saw the stitch length regulator and it is like the Singer class 15 machines.
BUT - it is actually a 201 clone, as the tension isn't on the face plate (aka nose) and it takes a horizontal
66 class bobbin. I'm not sure if a 66 bobbin cover plate would work or not. I can't see the edge of the machine to see if it is like a 66 slide plate or not. I will look and see if I can find some pictures that might help.
I'm glad you were able to post pictures.
ETA - Here is a slide plate for a 201
https://oldsingershop.com/products/s...32394289872932
and this is what a 66 bobbin area looks like
https://media.rainpos.com/5806/66_sl...ate_spring.jpg
This manual may work, but there are some differences. While it says it is for a 115, it is not the very early Singer 115.
https://web.archive.org/web/20211101...ng_Machine.pdf