What I have to say will probably sound vague. That appears to me to be a Japanese made 1950's - 60's machine. If I'm correct, the same machine was sold under several different brand names. In my experience, you will have to find your manual by the appearance of the machine. The way I've done that is to put the name on the machine as a search term, such as "Super de Luxe 135 Automatic sewing machine manual". It should take you to a site that specializes in sewing machine manuals. Generally, the name of the machine will be accompanied by a drawing of the machine. You are looking for a drawing that is identical to your machine. It might be called a "Morse Super Duper model 17". If it looks just like your machine, that will be your manual. They are usually about $10.00 for a downloaded copy.
It takes a little time, and sometimes you won't find it until you go to the third or fourth site. But, with patience you can usually find it. All the sites don't necessarily have same manuals.
Good luck
bk
If you can find the manual, it will help, as it had the oiling points for the machine. The older machines are all metal and need the moving parts to be oiled sometimes. As IceBlossom says, threading and operating the machine can be an easy fix.if you can't find a manual. Most machines thread basically the same way. If it has a bobbin, you just buy more like it.
Last edited by bkay; 09-08-2023 at 05:51 AM.
Reason: added thought