Golden Touch & Sew Model 620
This Singer 620 may seem like an improvement on the popular slant-needle machines. in fact, it does have several new gimmicks such as a needle threading aid and a bobbin that is easy to fill. However, for someone who wants to collect an older machine for serious use, this may not be the best choice. The reason we say this is because the 620 machine has nylon gears. Nylon gears, sometimes referred to as "plastic" may deteriorate with age. They appear to be biodegradable. A Singer repairman also told us not to lubricate nylon gears as petroleum may accelerate deterioration. In any case, if one of these machines is purchased for home use, check the gears to ensure they are serviceable.
Unlike the 500 and 401 which has rotating dials, the 620 uses sliders to select stitch patterns. These controls can be seen above.