VAM assistance: 1879S

I came across this 1879S today and something caught my attention. There seems to be, what I am calling a reverse die clash. I call it that because I am not sure what else to call it. The marks are incuse, that is why I call them a reverse die clash.
If you look at the pic you will see, circled in black, what look like tail feather tips.
The obverse, as shown looks to me like a VAM 26 as the 879 meet all the requirments; the nine and seven are doubled and the 8 has a blob of metal between the loops on the left side.
Please advise on the reverse of this piece. At first I thought it was just an ordinary contact mark/ding, however these marks are semetrical and they look like they might be tail feather tips.
Thanks.
If you look at the pic you will see, circled in black, what look like tail feather tips.
The obverse, as shown looks to me like a VAM 26 as the 879 meet all the requirments; the nine and seven are doubled and the 8 has a blob of metal between the loops on the left side.
Please advise on the reverse of this piece. At first I thought it was just an ordinary contact mark/ding, however these marks are semetrical and they look like they might be tail feather tips.
Thanks.
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Stuart
Collect 18th & 19th Century US Type Coins, Silver Dollars, $20 Gold Double Eagles and World Crowns & Talers with High Eye Appeal
"Luck is what happens when Preparation meets Opportunity"
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Could these marks have been caused by another coin striking the reverse? But then again would we not see more areas where more marks would be?