From the number you posted, it appears to be a
Gritzner, a very fine German made sewing machine. You may purchase a manual from
several places. It appears that a service manual is also available.
There is a group on
groups.io for old Kenmore sewing machines. They may have a manual in their archives for free. You would have to join, but there is no fee. I don't do Facebook, but there may be a group there, too. The Kenmore group on groups.io is a pretty active group.
There is also a woman who no longer posts here, who has two different Kenmore Gritzners. You might search for her posts on this forum and find some information. If I remember correctly, her user name is kenmoregal.
If this doesn't get you where you need to be, post again.
bkay