Hello ! I'm new to this forum and have a machinery question that I'm hoping you can help me with...I have been contacted for potential purchase of this Singer sewing machine. I am told it is model #3139 - I have been trying to research it but can't seem to find any listing of a model 3139 anywhere on the internet. If anyone can help identify this machine and if you have any information on what type of work it would be best utilized for I would really appreciate it . I'm attaching photo - it is the front machine on butcher block table . Thank you -