SEAL Team 3 / Three, Troop 1 / One Navy Challenge Coin

Here's one comparison of an actual unit SEAL Team 3, Troop 1 image comparison challenge coin. 

Acquired real one from a well known retiring Chief from the teams.

Fake SEAL Team 3 coin acquired from an ebay seller.

This fake coin was making its way into the collector community a few years ago, and is still making its way into it from time to time.