It's armoured!!
Charlie, I can attest to the fact my Fox (with a triangle) is armoured. It will shred a drill bit or any other device you set to work on it.
Just below the triangle is a small dimple that looks like the beginning of a torch cut. I think this was part of a test to determine if the armour was acceptable. They would heat a section for a period of time, and if it melted or softened too much, it was rejected. I can't say if this was done to the plate before it was assembled into a hull (smart) or after (bumb). Mine looks like it stated to cut, so think it failed and got the triangle.
A similar test was done on cariers. In several places you'll find an oval about the size of a quarter. In the middle is a 1/8" depression. This was where they heated and then stuck a rod in. If it didn't go through, the armour passed.
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