As I recall, the Spartan is definitely a collectible Singer. This one looks like it is in pretty good condition.
Featherweights are prized for their light weight, making them easy to take to classes. This one would be more of a stay-at-home machine for someone who enjoys collecting and using older machines, especially for nostalgia value.
I used to collect old Singers and fix them up; really enjoyed it. However, many were in cabinets. One day my dh mentioned that they were taking up a lot of space and collecting dust, because I never used them. Realized that for "real" work I always preferred my Bernina 1230. Ended up selling them to another collector.
If I were still interested in collecting, I would collect only "portable" machines not in cabinets, and this little Spartan would be an acquisition I would definitely be interested in!