Found a 1924 D in AG condition. The coin is actually is very presentable condition; the copper is naturally toned. No nicks, scratches, or discoloration. The only thing is that the 4 and the D must be viewed under a magnifying glass at an angle. But it is unmistakeable that it is a 24 D!
Alright! That's a 2.5 million mintage - GREAT find! In fact, there are only 4 coins with lower mintages... and they're all "household names" at least here at RealCent. Ranked by lowest mintage: 1909SVDB 1931S 1914D 1909S 1924D