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Posted By: davidcycleback

Circa 1980s, there was a guy who rebuilt the corners on Goudeys. If you held the cards up to the light, the corners let through a different amount of light. The restoration involved glue and chemicals, so a black light would likely help.

Rebuilt corners and other major surgery is generally straightforward to identify. Also, it's expensive and time consuming, so it will only be done to expensive cards like a 1933 Goudey Ruth or T206 Cobb.

Rebuilt corners are rare on the market and the resulting card will often appear highest grade, like Nrmt-Mt or Mint. Someone collecting lower grade cards cards, especially ones with worn corners, doesn't have to worry about rebuilt corners.