1901-O Morgan dollar, Choice Brilliant Uncirculated.  This used to be a significant rarity, but is not now, after the 1960s Treasury Department silver coin releases.  This specimen is a "blast white" lustre-rich example of a year and mint in which the dollars are (now) plentiful in Mint state; just "cherry-picking" is needed to acquire one which matches your tastes.  It's a notable addition to a collection!