The "A" reference in Singer's model numbers pertain to the location of manufacture. For most models, A = Anderson, South Carolina USA. For the 500 machine most were made in Elizabethport, NJ including the "A's" The only difference between a 500 and 500A or 400 and 400A or 301 and 301A, etc. is that the "A" denotes manufacturing plant, whether Anderson, SC or elsewhere.
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The Singer 2517 Sewing Machine is quiet.
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If you Google singer sewing machine in Google Images (see link below), you'll get these images!
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There were no Singer sewing machines in 1803.
Singer Sewing Company
Isaac Merrit Singer developed the first commercially successful sewing machine, the famous Singer Sewing Machine.
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Thomas Saint is the first person to create a sewing machine.