I'd like to preface this with that my relationship with Coollines Art has been only through e-mail and while we've never struck a deal they have always been prompt and polite.
That said, they do things differently than I would and one of those is "restoration" of their art. One example is Curt Swan's cover for Superman Annual #7.
This Curt Swan piece was sold on Heritage in 2007 -
As I understand it, the Heritage buyer sold/traded it to the Donneleys.
They now show it on their site as:
A conversation on the Curt Swan FB fan page led to an e-mail conversation with Steve.
Steve told me in that note that:
So, they restored the cover to its original state by re-creating stats.
An interesting point was made on the Swan FB page by Ray Cuthbert about Steve's assumption:
While I would not have mounted "replacement stats" on the original Swan piece, I might have done it on an overlay.
There are several takeaways here:
1) People do try to "restore" art and Coollines is one place that does.
2) Proper restoration is hard.
3) Be an informed buyer
PS. If you are interested in the Swan FB Fan Page, let me know.