I have combined all of the info that I could find (SCD guide, Gilkeson book, etc) from any sources, and have also completed what I believe to be a master set. In the process of putting together sets, sometimes new cards turn up. That doesn't happen much with Topps cards, but my Baseball Magazine supplement collection has a few that aren't catalog listed and numerous variations of ones that are listed.
That being said, I also keep my eyes open for new variations that pop up in the hobby (like the new 1963 Davenport variation that Tom Gordon posted about last week), which sometimes leads me to a new hunt to re-complete a set.
I'm not a fan of what I consider printing defects (like the 1958 Herrera, or various cards with breaks in the lines surrounding borders), but I tend to follow along with the SCD guide as the final say. One of the Spahn "variations" in the 1959 set is, in my opinion, just a print defect, but I still "had" to have it to complete my set.
Doug
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