Are recent Craigslist ad for a set of Revere Ware is a perfect example of the difference between the vintage era Revere Ware (1939-1968) and the newer Revere Ware. The ad claims “6 qt. Dutch oven is the only piece that is NOT copper clad. It too is a later piece.”
Note the newer style handles. This is clearly a post-1968 pot. I’m not sure if Revere Ware maid stainless only pieces exactly like this but I suspect what happened is the thin copper layer of the inferior process used after 1968 has worn off over time. Something that can wear off from simply care means the copper layer is so thin it isn’t doing what it is supposed to – spreading the heat to avoid burns.