I have a vintage SewMor portable sewing machine

I am trying to find the value of this machine. It is still in the original case with all the original paper work and all parts. ( Im not sure what year it was made or I do not know where to look for it) But I did find the model number (model 755) (not to sure about the last 5 but that is what it looks like to me) I also found the serial number it is B5358507A. 25-60 cycl. If ANYONE knows anything about this machine would you please contact me with any and all info. It is also for sale. My name is Jeana and I look forward to any response(s) that I may get. Thank You