I had to go down and drag my mom't old portable singer out of the back of a closet ... Ugh it is very heavy to be called such a thing. It is electric, but looks like yours. I checked at your link and found out that it was made january 15, 1951. There are tons of attachments still with it and the case is a rounded top wooden part that fits with the machine. there was thread still on it! LoL!
I am thinking that this is the one mom got for christmas when we were kids. The belt looks like it needs replacing, so I am not going to try it before that gets replaced for sure! I could just see it coming off and hitting me .... my luck. She still used this machine up until she died six years ago. !!!
This was fun henry .... Thanks!