I'm sure that's right, JoeJr. Mom sewed through the 1960's and 70's with that machine. I never saw a plastic bobbin until 1972, when I received a 758 Touch 'n Sew as a wedding gift. I no longer have the 758 (traded it in for a Bernina), and it looks as though the 403 has held its value better than 758--though I don't plan to sell it.