I have a walker question

[MorganMan]

I have noticed in a lot of photos of UNC walker halves, that there is a "Halo" area on the obverse. The first few times I saw it, I assumed it was maybe toning, however, after aquiring a few myself, I am seeing it is somthing to do with the metal flow of the strike it seems. There may be a thread already discussing it, but I did not find it. Has anyone heard a plausible explanation for it?

 

 

MM

[BillJones]

Yes, it's metal flow. The eagle on the reverse sucks up the medal and leaves it's ghost on the obverse. This is often a weakly struck spot right down the eagle's outstretched wing on the corrisponding spot to Ms. Liberty's body on the reverse.

[TomB]

You can also see this effect on Barber half dollars where the metal flow affected by the eagle on the reverse leaves a "V" shaped halo on the obverse.