The Strong D variety of the 1911-D is by far the king of this series and is a well-known key date throughout numismatics. Its mintage is only 55,600 which is far tinier than it sounds when compared to every other date in the series that are all over 200,000. This coin is rare in all grades and is popularly traded from the higher end AU range to MS62. MS63 examples are a step up and every grade beyond that takes a massive leap in value and rarity. The finest known MS66's are six-figure coins. The only slightly comparable date in the series is possibly the 1914 but this Strong D 1911-D is certainly this series' claim to fame. The strike of this key issue is fairly decent with all the same specs as earlier dates except a faintly distinct orange-gold coloring overall. Since it is a rare coin, counterfeits are out there so to avoid those make sure the mintmark and surrounding area are weak and the top right edge of the obverse features somewhat of a wire rim. Also be aware of the Weak D variety which is more common but still quite scarce. That variety may take a loupe to get a good look at the D mintmark.