If your machine says "Victoria 7910" on the faceplate, it is mechanically nearly identical to models sold as "White 790," "Kenmore 158 series," or "Morse 4300."

as they share the same internal mechanics. You can search libraries like

The Victoria brand has long been a staple for those seeking reliable, non-electronic machines. The 7910 "Graffiti" model specifically gained a reputation for being a "workhorse" capable of sewing through multiple layers of tough fabric—demonstrated in tests to handle up to 8 layers of denim or 4 layers of leather with ease.