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Saved a Singer 491D today - more info in comments & link : r/SewingMachinePorn
Singer 491 with stand - Sewing Machines & Sergers - Lakewood, Colorado | Facebook Marketplace
Picked this Singer 491 industrial straight stitch machine for £125. Did I do well ? What do you think ? : r/myog
Singer Sewing Machine 491D. Service Manual and Parts Chart for 491D200GA & 491D300GA : The Singer Company : Free Download, Borrow, and Streaming : Internet Archive
Used Commercial Industrial Singer Sewing Machines"
Singer 491D Service Manual | Singer 491 Parts Diagram | Singer 491 - YouTube