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Message:: [QUOTE="proofartoncircs, post: 1000679, member: 25952"]From the link given to the Coin Forum, I have copied the descriptions of the Type M and the Class III doubled die ordinary business / type M. I originally wrote it, so I guess I can copy it.   The link has the pictures of these two varieties plus two others, all dated 1970 D. TYPE M The first 1970 D reverse pictured is the special proof design of 1968. Nomenclature gets awkward here. According to Breen and this forum, all pre bi-centennial clad reverses (with the exception of Type B) are Type C. But there are 6 versions of this from 1965 - 1973. In keeping with the commonly used A, B, C, I will call this one M for modified. (In my 1986 article it was a IIIm and Dr. James Wiles and Coneca will call it a RDV- 007). This M artwork was made from the regular business strike artwork of 1968 (a IIIb or RDV-006) and both the master hub (design, including field subtracted) and master die (design added) modified.  The first item to note is the inside edge (IE - I will be using the same check points as we go along) of the eagle's wing. This is very sharp and like a vertical wall. My fingernail will catch on the wing boundary if I drag it across the field. I am able to pick out this variety with my eyes closed. This boundary is obvious and the sharpest you will ever find on a Washington Quarter reverse. In additional the vertical wing segments have outlines added in relief. Perhaps this is most obvious on the left (viewer's) wing tip.  There are two leafs just to the left of the arrow points. Consider the leftmost one (LL). This has been extended upwards while the one to its right (RL) is nearly normal as compared to most other varieties. It does not show in the picture but the left leaf extension is obviously added on and appears doubled. I guess we have some 20th century recutting doubling here. The right leaf shows doubling to a much lesser degree. The gap (GAP) between the arrow points and the next leaf is most odd. It is like a hologram. As you rock the coin back and forth it appears to be a gap at times and closed at times. The barb of the top arrowpoint (TB) is missing.  The barb of the bottom arrowpoint (BB) is present. This "M" version was used for about 75% of 1968 S Proof production and for no other proofs.It was used on 12 % of the 1969 D, 11 % of the 1970 D and 6 % of the 1970 (P) business strikes.It appears in most of the 1970 mint sets. Many of these were cut up for the Kennedy half of that year. Hence 1970 D "M" is now quite common in dealers' stocks. DOUBLED DIE The last picture is a class III dual hub doubled die. I call it a IIIb/m and Coneca uses RDV-006/7.I present it wih mixed emotions. I had three nice die varieties going and now this complicates it.In 1970, it almost seems the mint forgot they had the IIIm and IIIB versions and used them indiscrimately. They use both hubs to make one die. There must have been some problem in alignment because many of then show rotational doubling to different degrees and direction. [I think I now have an uderstanding as to how this happened.  I will post on it later]  4.4% of the 1970 D production in my search of 1,000 1970 D quarters were doubled dies. This would require about 100 working dies. In the meantime 1970 (P) IIIb/m were less than .1% of a small mintage and appear to be one die only. [Dr. Wiles has now identified 2 dies.] Inside edge of wings - intermediate appearance between the M and ordinary C versions. The bad thing is this can appear in several different degrees. The contrast between wing and field is intermediate but the left vertical wing inside feather relief outline is present, although its position versus the feather can vary. The two leafs are similiar to the type m in that they show evidence of doubling. The gap is similiar to M. The top barb will be fairly strong if the IIIb hubbing was clockwise. I assume most of these doubled dies are probably next to worthless but two of them are in the Cherrypickers' Guide. These are FS-25-1970D-801 (Coneca 1-R-III+V) and FS-25-1970D-802 (Coneca 2-R-III+I). I didn't recognize from that book but saw pictures of the full coins on TeleTrade. They have been reported as being in mint sets. About 5 % of mint sets are IIIb and most mint sets have the IIIm. [/QUOTE]

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