John,
I thought you had one too, but I just couldn't place it in pink. I never noticed the porcelain drum before today, and while I always liked them in GE dryers, I have wondered how necessary they were.
Besides energy usage, porcelanizing is very non-environmental as well. My father sold acid to WP in the 1960s and 1970s (I think it was HCL) when we lived in Michigan. He visited the St. Joe plant many times, but I only learned this fairly recently. They bought rail tanker car loads of it to etch the metal of baskets, tops, lids and other parts before the glaze was applied.
The finish in my 1977 KM dryer is 50% gone without any effect on its performance, and my Mom's isn't far behind. Hers has a drum light which shows off the wear, but there seems to be no issue otherwise. Had all those 29" WP/KM dryers been porcelanized, there would have been a lot more industrial acid waste to dispose of!
Gordon