I have a 1881 Victor that I am restoring. The straight bobbins, belts, etc. are available at sewingmachinesplus.com.
I got really good service.
Your machine head looks exactly like my mother's Singer #27 except for the decals.
I love your machine. Just be patient in restoring. It takes a lot of time. I have to take my head all apart and clean inside. I can see the grime through the access hole. Billy's (Lost51) instructions have been invaluable.