In a Numismatist article published between 1977 and 1982, three die pair varieties are identified as being capable of producing genuine no D coins. All 3 are valuable in Mint State. However, since 1987, only die pair #2 has been recognized as valuable in circulated condition.
The reason for this distinction is that in 1987, die pairs #1 and #3 were recognized as "filled dies", which can show a very weak D. It is not possible to reliably authenticate these as "no D" unless they are MS60 or higher, because only full mint lustre is sufficient to a detect a fake (removed D). The standard for MS specimens is that there must be no trace of the D, under 10X magnification.
However, for die pair #2, the D never appears (even weakly), because it was ground off the die by abrasives. So die pair #2 can be authenticated even in circulated grades. In addition, die pair #2 is less common in all grades than die pairs #1 and #3.
The 3 die pairs can be identified as follows:
The PCGS grading service does not distinguish between all 3 dies. The only designations they use for 1922 no D cents are "Weak Reverse" and "Strong Reverse". Only the "Strong Reverse" can be die pair #2; "Weak Reverse" corresponds to die pairs #1 and #3. This means that a PCGS 1922 no D Weak Reverse EF40 is only worth about $15. This is the same as a 1922D EF40, and about equal to the cost of having the coin slabbed by PCGS! The ANACS grading service apparently only certifies die pair #2 as "no D" in circulated grades (at least since 1987).
This information was compiled from posts to rec.collecting.coins, dated between 12/30/96 and 1/3/97, and found in http://www.dejanews.com .