Pls Shed Light On This 2010 S Mint Sacagawea Edge

O crap I'm sorry I put the D mint on the left next to the S mint which is the rough edge one on the right to show the difference in thickness and in the alignment of the stars the dates are aligned exactly the same so that you can see from the first star how far off they are it is almost like the proof, on the right, is missing a star and like I said really rough

As far as the noticeable line break goes, I have two Native American dollars at quick reach, and they both have it. It looks as though the edge collar is two pieces, but then again, that makes sense as the edges of proofs are applied after striking of the coins as to give them only (in theory) one position, in contrast to normal coins that have two positions (where edge lettering is right side up or upside down when you lay the coin face up).

Where thickness is concerned, mine appear to be thicker than normal as well, but they are in 2x2's, so it's rather hard to get a "good" look.

And, where star placement is concerned, since the collars appear to different configuration than the ones used for normal production, it's all entirely possible that the stars are spaced differently on them.

Note: I'd strongly recommend wearing white cotton gloves when handling (especially) proofs.

The edges are created on the dusiness strikes and the proofs by two different methods.

On the business strikes the edge is produced by rolling the struck coin between a roller and an edge die that puts the whole edge on in one pass. This can result in slippage of the coin on the roller if the pressure on the coin isn't just right. That can cause variation of the positioning of the elements on the edge of the coin.

On the proofs the edge is created by a three piece segmented collar during the strike. Since the edge is all created at the same time everything stays in the same relative position. And since the collar is in three pieces the metal of the coin also squeezes into the joint between the collar pieces creating the three raised bars on the edge.