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Help with CBH attribution
I have been working on attributing this CBH and I think I have it narrowed down to O-111. A number of crossbars extend into the left wing and two extend slightly into the right. 50C sits high and leans to the left. The 5 has a long crossbar and sits much higher than the 0. The 18 is slightly wider than the 833 and have broad points. Thoughts?

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Often collectors will focus on the "I to T" relationship, which is a great way to narrow down the die marriage choice. You can also view the position of the "N" in UNUM relative to the "F" in OF or where the scroll ends.
The more of these that match, the higher the probability the reverse die can be attributed accurately.
On the obverse, the position of the star points relative the denticles works well ... if denticles are present. Another way, albeit qualitative, is to look at the relative distance between stars. Some obverse dies have a pair of stars that are noticeably closer or farther away from each other than the other stars.
See http://www.doubledimes.com for a free online reference for US twenty-cent pieces