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The Singer 66K and the Singer 99K – how to tell them apart | oldsingersewingmachineblog
The Vintage Singer Sewing Machine Blog: A Visual Guide to Identifying Singers from Crappy Craigslist Photos, Part 4: Ruling Out the 27/127, Ruling In the Model 66
They don't make them like they used to — Helen Poremba
Singer sewing machine Model 66 and 99
Singer 66 or 99 - how to tell the difference - YouTube