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MarkBuy with confidence, if you have a PSA Letter from Taube. The reason some bats are graded is that the seller/consignor feels they will fetch a higher price by having the numerical grade.
It is very similar to autographed baseballs.... PSA will do a perfectly good LOA without a number grade, or they can do a more expensive LOA which assigns the numerical grade.
In many cases, the non-numerical Authenticated Bats can be nicer than those which are numerically graded. The previous owner may simply not have felt the need to go for a number grade, or they did not want to pay PSA the extra charge for assigning the number grade. Either way, it is not a negative. Hope this helps...