The Meyers. Husband and wife duo that do pro restoration work. But go waaaay overboard. Restoration on steroids. More like recreation than restoration.
CGC at one time refused to grade their garbage work, so CBCS welcomed them with open arms. They got into a legal battle with CGC. There is a thread about it in Comics General.
Their stuff is easy to spot. Super high grade restored GA and SA, CBCS graded, label notes usually indicate:
Extensive [fill in the blank]
Example: before and after
After:
Before:
Et voila.