1975 Topps Mini Charlie Conlon Collection
It appears to be quite the gamble to find a PSA 10 or BGS 10 in these boxes. Quite frankly for the true collector, owning a complete set of PSA 8 registered is far more valuable in my eyes and it would not cost you the amount of two of these cello boxes for sale on eBay. One of the great purchases that I made from the Topps 1975 baseball mini series was two boxes of 990 cards already sleeved and placed into plastic sleeves in which all are mint or nrmt. I made this purchase back in 2006. The total cost was $580.00, when I made this purchase there were still wax boxes of 1975 Topps mini (36 packs) available for $1300.00 plus. Now you cannot purchase these for under $2000.00.
While these cards are more and more quickly becoming favorites, they are full of factory defects, and the very colorful borders make them very difficult to not notice and extremely difficult to get in a high grade. This is why more and more, I am leaning towards getting a PSA registry set from one of the few vendors that have these cards already graded.