That's what I was trying to explain to him. When they're not struck deep, they're clear. When they're deeper, it's hard to male out the "2" because of the circle from the edge of the die around it.
Here are a few more, one of which is starting to get deep, looking a little more like yours, Shelby, which is really deep. I know I have some deep ones somewhere. Probably my orphan sockets cabinet, which I can't get to right now. The "two diagonal lines" you are seeing are the space between the looping upper part of the "2" on the left and the body of the "2", and the space between the body of the "2" and the base on the lower right.