Somehow this section of the FORUM managed to overlook John Robert's discovery of two obverse die markers for early die states of the March T2, ie, before the classic reverse die crack marker becomes visible.
Here is a link to Robert's break-through article :
http://www.anacs.com/contentPages/ShowArticle.aspx?ID=51 (we've also published John's article on our web site under Articles of the Month).
The die dig under the N of IN appears small, round, in relief and shiny. Upon rotation ("wobble") of an early die state March T2, this little nubbin just shines out. As the die ages a bit and the marker reverse die crack in STATES begins to become visible under a loup (aided by a sharp oblique light from above that picks up the in-relief variegated die crack), the little nubbin begins to fade a bit but is still easily detected.
By the time the reverse die crack is nearing its fully developed irregular trip through the tops of the letters of STATES, the little nubbin is beginning to fade. If you've seen it in earlier die states, however, you can almost always spot it.
The upward-slanted short die gash angling NorthWest out of Ike's neck (about even with the middle arm of the E) is usually starkly visible in earlier die states when the reverse die crack is not present or just beginning to develop. As the reverse die crack matures fully, the neck gash may become submerged in die-flow lines, but patience may allow you to tease it into visibility as you carefully wobble the candidate T2.
Since we can now definitively identify all March release T2's, we can with equal certainty identify the August release T2 struck before its clash episode (which produced a small but naked-eye talon image ("Talon Tip") and reverse die abrasions in the vicinity of the Jaw Line) by the absence of the nubbin under the N and no die gouge off Ike's neck.
So. thanks to John Roberts we can securely distinguish all March and all August release 1972 T2's, a wonderful advance: only severely abused or worn T2's may remain problematic in this regard. Rob
Now is the time to cherry Ikes. Lots of fruit still on the trees but don't wait too long. Rob Ezerman