For the past several years, the Herters 28 gauge shells have been made by Winchester. The hull is identical to the AA, except the tube is black. Even the basewads are red and stamped “WW”. Punch out the primer, and you’ll see that the head is brass, not brass plated steel, as it will not stick to a magnet once the primer is gone.
Current Herters .410s are also made by Winchester, and the hulls are identical to the AAHS, except for the black tube. Current 12s and 20s are basically a Winchester Super Target or Universal hull.
The previous Herters 28s from 5-10 years ago used a Cheddite hull with a high, brass plated steel cap. It’s really easy to tell the difference.