Can you look at it in person and take her for a ‘test run?’ How much are they asking?
Have you seen the thread here ‘Vintage Sewing Machines?’ Here’s the link
http://www.quiltingboard.com/t-43881-1.htm Vintage sewing machine lovers (and Billy who has a ton of knowledge about vintage sewing machines) participate in this thread. You could also post a question on that thread directly to those who collect, use and love these vintage machines.
I have a FW 221 and would like to get the 301 also. My little FW is not made for heavy fabrics like denim although she would probably do it. I’ve read that you can FMQ with the FW but haven’t done any FMQ yet. Both machines are similar but the 301’s motor is about 4 lbs. heavier than the FW’s so I’m guessing but don’t want to give you the wrong advice.
Good luck and please keep us posted on how this goes. If you do get this machine share a pic with us.