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T206Collector<<1. Whatever is wrong with that Cobb is not a "serious" flaw if you have to look that long and hard to notice it. You should be able to see an immediate issue with an SGC 30.>>
That's a definitional issue; and a subjective issue. When I see an SGC 30 like that, I know it has spider wrinkles or glue residue. If it was an SGC 40, I would know that there was no glue and only one spider wrinkle. If it was an SGC 50, I would know that there were no wrinkles.
<<2. If one assumes that the majority of T206's that exist are in the low-mid grade range, wouldn't you want a greater range of distiction bewteen them since that's the greatest sample size you have to judge?>>
That is why SGC has a few 'tweener grades (e.g., 20 and 70). PSA certainly doesn't offer that.
SGC would like to have 25's and 35's, but they've run into a big problem in that so many 20's, 30's and 40's have already been slotted -- they run the risk of pissing off their most loyal following.