That's a perfect 'leave behind' kit for practice spaces, etc. As it sits, and for that purpose, that's a $250 kit tops. There is no way you are going to restore it. Nor should you, there are just too many better candidates out there.
Congrats, the S on two of the tags is for Othie Shields, one of the drum assemblers in the Covington OH Rogers shop. Probably second most common initial found, after F (sometimes FW) for Frank Walters.
And 100 years from now KO's grandsons are going to have to tell the 'new' vintage drum collectors how WFL III isn't remotely related to WFL .... But it is .... But it isn't.
This job's yours to keep Kevin.
If your typical 60s German drummer was comparing Ludwig QC to Sonor QC, I get it that he might conclude Ludwig was exporting the duds. But no, the duds were randomly interspersed everywhere. Get it out the door. No company could ramp up like that and not suffer manufacturing disparity. The worst...
He had them priced right, at $1800 in the FB ad. If I didn't have December travel plans already firmed up, they would have been mine. But no worries, congrats!
Actually if the seller had spelled Rogers correctly, I'm sure they would have sold much faster!
Frankly, I think you're all way off base. There is not much demand for display kits. As a grouping, I would retail value it absolutely no higher than $700. Yes, likely more if you piece it out, temple blocks, if the cymbals have the right markings, etc.
As Rich says, it all depends on the...
This strainer certainly looks to be nicely installed from the inside, no traces of a hack job that I see. And this snare is so clean, I can't see how it would have needed a new strainer installed without any evidence of heavy use anywhere.
Also some interesting prior owner history found inside...