Zig zag pattern on 1826 half reverse

Anyone have any idea why this zig zag pattern would be on this coin?

 

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It is obviously damage - possibly a counterstamp of some sort. Is the coin damaged (flattened) at the corresponding location on the obverse?

 

I didn't noticed any obvious signs of flattening on the obverse, besides the all around worn quality of the coin, in that particular area. I was thinking it could be a counterstamp of sorts, as I have coins from that era with counterstamps, but not in this design.

 

Perhaps the word "copy" was X'ed out ???

 

That was another thing I thought of too. I put it under a magnifying glass and didn't see any lettering. I doubt it'd be that small to fit under that zig zag, but who knows.

 

consistent size, could have been a roller of some kind? like a cloth tracing wheel roller?

 

I will add this, the coin is quite worn. Some details can be made out (reverse looks better than obverse), but this coin has seen quite a bit in it's life, so hard telling where it came from.

 

Looks like a pattern counterstamped on it. I can't imagine what it represents though. If this were a counterstamp, the coin wouldn't necessarily show a flat spot on the obverse because the pattern appears lightly struck.

Bruce