Yes I have!I own 12 of them in PF67 up to PF69.Very rare coin in high grade!If you read this link it will tell you all about the 1964 transitional AH reverse on the 1964 Kennedy Proofs.
http://www.coincommunity.com/forum/topic.asp?TOPIC_ID=177905. When you see the 1964 PF67 Star Cameo graded by NGC, 3799630-001(Transitional Die Coin)This is one of my high grade transitional Kennedy's.Maybe someday NGC and PCGS with put this information on there labels in the future.