2021 D Alabama Tuskegee Airmen "Master-Die Artifacts" And "Master Design Artifacts"

This is my first post so please excuse any impropieties, taboos. I welcome constructive criticism.

I was about to roll some quarters and decided to look for errors before proceeding. I began with Notable Americans and the Alabama Tuskegee Airmen quarters.

Beginning my exam with 3.5x lighted glasses I found something unexpected on the two P-51 Mustangs. Initially, Gemini could not validate what I was seeing and put it off to grease or metal fragments. But what I found below the back of the cockpits and just in front of the Army Aircorps Star and Stripes insignia was very distinct.

On the larger plane in the foreground is the number "2". On the plane in the background and even smaller is what looks like a "4".

Getting deeper into AI, I learned about Master-Die Artifacts and Master Design Artifacts left behind by final proofers when things are so small they don't get caught and erased before the die goes to the CNC machine.

I'd like to hear of more microscopic forensics focused on numismatics.

The images are from two separate quarters.