Check out the youtube videos by niftythriftgirl, she has videos for both. Sewing Pattern Review has useful information on the 1757. I am sorry that I do not have a manual for the 1757 to compare. I've learned to never pass up a sewing machine manual in a thrift store, so I have the manual for model 1730 and model 1756 all in one cover. I went through this manual and noted that the only differences between 1730 and 1756 that I could see is that buttonhole making differs between the two, so understand why they would put out one manual to cover two machines.
Last edited by elnan; 04-22-2015 at 10:16 AM.
Reason: clarify