Singer heavy duty 4423 or 6600c

[Dominique]

Anyone used either of these machines for leather long term? I had a 6600c and ended up selling it to another leather worker and she loves it and I regret selling it but since been looking into the 4423 since I don't need computerized and don't need a lot of stitching options. Just wondering if anyone on here uses as their everyday machine for leather 

[Wizcrafts]

31 minutes ago, Dominique said:

Anyone used either of these machines for leather long term? I had a 6600c and ended up selling it to another leather worker and she loves it and I regret selling it but since been looking into the 4423 since I don't need computerized and don't need a lot of stitching options. Just wondering if anyone on here uses as their everyday machine for leather 

Those are not industrial leather sewing machines. They are domestic, or household hobbyist sewing machines. They are neither heavy duty, nor meant for leather. This is the wrong forum to get information about domestic sewing machines. I posted a picture below of a real heavy duty leather sewing machine as a reference. It can sew over 3/4 inch of hard leather with needles as large as roofing nails and thread 10 times thicker than anything the domestic machines can handle..