I don't think your machine was serialized by Singer, so the Singer database wouldn't apply. I have a similar machine from the Podolsk Mechanical Factory. The serial number of my machine also starts with a C, the decals are different (though the badge is the same as yours), they look very much like the decals for the Singer 101. The factory was originally a Singer factory that was nationalized after the revolution. I determined that my machine was Russian made probably late 30s or early 40s.
The "им. Калинина"at the end of the your badge name puts it after 1923. If you copy/paste the Cyrillic Подольский механический завод (found at the top of the badge) into google it'll turn up a bunch more pictures of these machines. Bring your Google Translate though! 😉
I'll see if I can find links to some of the web pages I used to determine the providence of my machine. But the above Google search I mentioned will get you a lot of information.
Tammy