I think you're comparing apples and oranges there, all the Redding No 2's have magnetic damping. The earlier Redding scales had oil damping or none at all. For about twenty years the Redding No 2 had an engraved scale, first ones were brown with a silver metal engraved beam, but in the same shape body as the current No. 2. Then they changed to green with a black beam, nicely engraved with white markings. Then then changed to the applied tape.
I can't imagine someone at a production meeting at the time saying "How can we make this scale better" but I can certainly imagine someone saying "How can we make this scale cheaper"
I think reloading beam scales reached their peak with the Lyman M5 in the late '60's, early '70's. The only advance (or sidestep) since then, but introduced not long after, has been the rotary poise and the approach to weight system as used on the 5-10 and 10/10 scales. Since that date quality has eroded, so slowly that it's often gone unnoticed.
If you compare a Lyman M5 with todays orange scale with a plastic body it makes you weep.
Redding No 2, engraved scale

Redding No 2, applied tape

Early RCBS 5-10, metal knurled adjusting wheel and 10th grain markings.

Later RCBS 5-10, plastic level wheel, no 10th markings