1948 Franklin ACG MS-65 FBL what is the line on the reverse

Can some one please tell me what is causing or caused this line on the reverse of this coin? Does it need to come out of this inferior holder?
Thank you in advance
Jim O'C.
obverse
reverse
close up at base bell
close up top of bell
close up middle of bell
crud near top of support bar
Thank you in advance
Jim O'C.






0
Comments
<< <i>I've seen lines like that on stacks of halves held together with a rubber band. >>
.......same here.
"Because I can"
myurl The Franklin All Old Green Holder Set
When rubber gets old from storage it breaks down and often leaves a mark
like it was burned in. Here's a peace dollar.
R.I.P. Bear
<< <i>I don't understand; it is on the coin not the holder. How did it get there? >>
It was there prior to being slabbed obviously. As the others have said, it was likely held together by a rubber band with other halves.
it also looks like it could be AU-58
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to the grade on the holder
you can leave it in the holder, or take it out, your choice.
then a unlicensed tpg put it in a slab!