Good call! Nice book! The late 300's early 400's Detective books are really surging. Especially with both Adams cover/art We should probably get them while we can still reasonably afford them. My cut off is 9.0, but in the case of Bat 222, I would go 8.0 or 8.5. I can't afford $800 for a 9.4 or 9.6. Sadly. And that's just Adams cover with the Beatles take!
My cut off is a little lower. For this time period, I consider anything less than 8.5 to be a set filler in my collection. These early Tecs are indeed very tough to find in high grade so I'm generally happy if I find something close to my standards. A slabbed, high grade Tec 411 still eludes me.