I sold recaps for 7 years so I may have a little experience.
More than likely your recaps are not a factory recap but where done by a private recapper; since you have No name on the tire it maybe a remold.
When they do a remold they buff the entire tire from bead to bead and remold the tire.
There used to be Top caps, ¾ caps and remolds on the market.
A place in Missiouri specialized in large tire recapping like grader and earth mover tires. I suspect that who ever did your tires is a big outfit like them.
Could you please tell us the name of the tire store/place where you bought your tires?
If someone is selling a true remold tire it maybe worth checking into.