2021 Silver Eagle Type 2 "Wa" Question

My Uncle was having me look at his new 2021 Type 2 Silver Eagle, and I noticed the "WA." At first, I thought this meant that it was the designers initals, but those were on the reverse.

I looked at a few other 2021 Silver Eagles and noticed that some of them didn't have the "WA."

So, what exactly does the WA mean? Side note, he bought this as a preorder, meaning it wasn't necessarily part of the "First Strike" but it was some of the first few produced (I believe).

Sorry for the glare, it's in a slip that he didn't want me to take it out of.





Another quick question, what does the "MG" mean as well? I know that the designer for the Type 2 was Emily Damstra, and her initials are to the left, but what of this "MG?"