Prince Namor, the Sub-Mariner #2 from Marvel Comics
When it comes to classic battles involving Sub-Mariner, people always think of his battles with the Human Torch or even his battles with the Incredible Hulk.
  But an overlooked one is with Triton of the Inhumans.  And with Triton being from his element, it makes for a more interesting fight. 

       

This is a scan of an old comic book. This item is not for sale. But you can find it on ebay.
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