Your analysis of the key date (business strikes) in the Lincoln Cent series is correct regarding the 1914-D vs. the 1909-S VDB. With all the public controversy with the engraver's initials on the reverse of the first year issue, and then almost immediate removal of the initials, the public hoarded the 1909-S VDB resulting in the enduring population of mint state coins in the numismatic market for years. As late as 1981 at the local coin show, a older couple came to the dealer table in the full roll of MS 1909-S VDB Lincoln Cents. The outer coins on either end were gummed up, but 2/3 of the interior coins were full red, pristine! We bought the full roll on the spot. Not so for the 1914-D and 1914-S with strong strikes! They're scarce! Incidentally, in the 40+ years of collecting mint state Lincoln Cents - I found the 1923-S, full red with strong strike the toughest!