Old 500 cc Patterson Tank System 4 tank and adjustable plastic reel, with grey lid.
I don't know much about this type of tank, but it seems like it should work fine. It is dingy and a bit dinged, but what can really go wrong with these tanks? The reel is quite stained (brown) from many processing runs. It should work fine, but if you don't like it, these reels are still made and should fit.
I don't know if there is supposed to be an agitation rod, which I have heard mentioned on these forums, or if it is an optional part. At any rate, it does not have one.
The only reason I would keep this would be to process 127 film, sooooo, if anyone wants it, I will trade straight across for one or two 127 stainless steel reels.
I also have two spare 500 mL Nikkor hand inversion tanks that I would trade or sell.