To me, the funny thing about estate-find FW's is that they generally tend to be found in near pristine condition. I inherited my mother-in-law's black, mid-50's FW. It too was in near pristine condition. Before her passing, she mentioned that she really did not care too much for sewing. She preferred to paint for her creative outlet.
I think she had gotten a FW almost as a required household appliance when she got married - mainly for mending or light-duty sewing. A FW Is all contained in a small box as opposed to being in a dedicated cabinet for full-size machines. Her mother had sewn all of hers and her three sisters' clothes, but my dm-i-l would have none of that as rtw clothing was much more prevalent and affordable than when she was growing up. I suspect many women thought that way as they raised their families in the late 40's until the early 60's. Hence, FW's really are not that rare and usually in very good condition.
John Thomas in NC