Shame. I was really considering this. Looked into the Anacs process yesterday to see how much a relevant premium would be for such a grade considering it's an MS-70. (I didn't know much about the whole grading thing). Would be interesting to see what this sold for as I'm pretty sure we'll be seeing Cas singles getting MS-70 pretty soon.
Last year who'd have believed even MS-69 as a possibility? Now MS-68s are quite common anything less than that is just, nicely put... Meh (besides MS-67)
I don't know. Some coins still grade 64/65/66 and 68s aren't thaaaat common. I think it should still fetch a nice premium for a while.
And congrats on the sale!