Introducing my Singer Family, I'll start with my Singer 201-2, living in a Singer #40 Cabinet. (Circa late 40s - mid 50s.)
I obtained this machine recently, and all I can say is that she sews stitches so beautiful it will make you weep. Smooth and quiet too. Surely one of the best straight stitching machines ever made, the elegant 201 is truly the Queen of home sewing machines from this era.