David Hall: Although the Illinois Centennial half dollar (more commonly known as the "Lincoln") is one of the earliest U.S. silver commemoratives, the mintage was huge and today the Linoln is one of the most common commems. The original mintage was 100,058 coins and they were initially sold at $1.00 per coin.
This is a popular coin with collectors, but you can obtain a Gem example easily. Nearly all known Lincolns are mint state, and the average grade is MS63 to MS65. Superb MS66 examples are readily available and even MS67 specimens are scarce only. Lincolns have frosty white luster or some degree of toning. There are many Gems to choose from!