Singer 4423 Heavy Duty Sewing Machine | 1,100 Stitches per Minute | Refurbished. The Singer Heavy Duty 4423 Sewing Machine is great for beginners and professional sewers alike. Other sewer-friendly features include automatic 1-step buttonhole, top drop-in bobbin, drop feed for free motion sewing, 23 built-in stitches and added accessories.
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