Doug, for the record, your Never-Break skillet was not a Griswold product. You may be referring to a sale write up by Worth Point saying it was in a 1939 Griswold catalogue. While that source can be good to see items, the information is supplied by the "seller", and not the most accurate data.
Never-Break was made by the Bronson Supply Co. Sales office on Cliff St., in NYC, factory was in Cleveland, Ohio. Here is a sample from an 1890 ad...