Washington quarter type C any info appreciated

Twinturbo

I was wondering whats the value of a type C washington quarter in MS60?
Im well aware of all diagnostics for the washington type C as well as it only occurs on the 1964-d
Also who grades them? and how expensive are they to grade? Any population numbers?
Any and all help is appreciated.

ProofArtworkonCircs

A minority of 1964 D's are the only silver type C. This was the first clad reverese and it appears on a minority of 1965 and 1967's.
For years it was thought only one die was used for the 1964 D C's, but now I understand two have been identified.

RadioContestKing

MS62 price guide 150 there are none graded 60 1 MS61 2 MS62 14 MS63 15 MS64 2 65 and only 1 66 none finer Enjoy

NotSure

The 'big 4' all grade them, and designate them.