Im going to show my ignorance. But I have never
Seen a kettle with this "peel" , was this a finish or an
Occurance
This was the finish back than. In todays standard, it would be considered a defect. My first Ivory MT lid had that effect and would have kept it as it was very unique and cool but the bowl finish was smooth and mismatch with the lid.
Here is Weki definition of orange peel.
Orange peel is a certain kind of finish that may develop on painted and cast surfaces, even screen protectors.[1] The texture resembles the surface of the skin of an orange. Gloss paint sprayed on a smooth surface (such as the body of a car) should also dry into a smooth surface. However, various factors can cause it to dry into a bumpy surface resembling the texture of an orange peel. The orange peel phenomenon can then be smoothed out with ultra-fine sandpaper, but it can be prevented altogether by changing the painting technique or the materials used. Orange peel is typically the result of improper painting technique, and is caused by the quick evaporation of thinner, incorrect spray gun setup (e.g., low air pressure or incorrect nozzle), spraying the paint at an angle other than perpendicular, or applying excessive paint.
60's and 70's kettles with peel ( more the better ), give more character and charm to already cool kettles. Highly desirable effect IMO.