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There are proponents for every grading service. Collectors usually buy slabbed coins because they cannot grade coins consistently themselves. Yes preservation is a factor, but grades equal value. When we purchase coins sight seen, the slab it is in means nothing. Many coins can cross over or even upgrade. The standards that each company uses have changed over time. They will continue to change. If you understand that no company will ever be 100 percent right all of the time, you can make a better decision.
You can look into their guarantees to make better decisions also. A few will guarantee their grades for the life that the coin remains in their holder.
So if buying sight unseen, this has to be a major factor.
The big TWO are not flawless either. They just market themselves better. As collectors flock to one grading service or another, others follow like Lemmings.
Every knowledgeable collector hears buy the coin, not the holder.
This valuable advice will probably never change.
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