Congrats to Charlie32 who correctly identified the coin as being in an ANA/PNG Official MS 63 slab. The coin is a lock MS65 by todays grading standards, and I originally purchased it as a crackout candidate. However, there aren't many of these old ANA slabs around anymore, and I just couldn't bring myself to destroy a small piece of numismatic history. I would like to thank all of you for your guesses and Charlie drop me a PM so I know where to send your prize.