I agree with Matt. Be careful with this one. Decent SL-1200MKII’s go for around $600 used on my local CL and are not beat up like this one. And have dustcovers too. Apply your $400 toward a good one. If you do like this one, offer considerably less than the asking price. The cartridge that it comes with is only $40 new.
And demand an audition. Make sure the tonearm bearings allow for free travel, up and down and left to right. Make sure the cueing is slow and smooth. Finally make sure the TT is holding proper speed. Sometimes, despite all these cursory checks, you may still have to open it up and do some maintenance and repairs. At least a good deoxidizing if the seller hasn’t done it already. If you are comfortable doing the work yourself, go for it. There are great bargains to be found with vintage. If you have to take it to a shop, you have exceeded the cost of a new TT. Good luck!