About to Buy a Technics SP-10!? Am I making a mistake?

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Exactly what are you getting for $600?
plinth?
tonearm?
if so, what tonearm?
what does the seller claim about working condition?
is he willing to guarantee function? 

By the way, it is almost impossible that the turntable could not be repaired, if in fact it’s not working correctly. All parts are available.

Looks like its been rode hard and put up wet. I've seen others that are in much better shape visually for not much more money. Bide your time and buy one that in the end you can be proud of.

Depends on you,  I've repaired many a turntable. If you get the arm,  I find it a no brainer,  I'd grab it. If it is the table only,  I probably would not.  

If you can buy everything what's on your picture for $600 then buy it quickly! 

EPA-100 tonearm alone cost $1200 minimum.
 
If SP-10mkII is working then the price is a steal !