Mercury Dime Prices And Jack Beymer

Such a question is pending purely on YOU. There are many out there that just want to fill an Album so the grade is irrelivant. Then there are thoes that just MUST have all MS or higher, if that were possible, coins. Some want only slabbed coins so naturally those don't fit well in an Album. At coin shows I've seen people sitting in front of a dealer with a massive magnifier looking at the Reverse of Mercury dimes and saying things like "those middle bands are a little weak". Then walking away. And then there are those that say, "wow is that one cheap, I'll take it, even though it's well worn". It's just what you think you need, want, can use, require, must have, etc.
So as to your AU-58 or AU-58 FB, might as well just go for all MS-71's.