The Touch & Sew series has their supporters, but in the vintage category the most sought after models tends to be sort of pre mid sixites. There are exceptions and not all Touch & Sews are equal. Some of the
older Kenmore models are very nice and regarded.
The design and solid build makes them noteworthy. There's a difference between the American made ones and the later (I think Kenmore was one of those brands bough up by Japanese Brother or Janome, something like that). Apparently
some were made i Germany? ...on further reading up on Kenmore, they seem to have been made by White before turning Japanese. You just have to check the origins of your Kenmores ;- ) A bobbin plate is a minor thing if the rest in nice. If you clean, oil, and track down missing parts, they are much easier to sell. Making a profit isn't easy, but its' rarely a loss. A fully serviced vintage machine, wires check and running fine usually sells rather quickly.