I mentioned to BBBH that the appliance was vintage 1949. She seemed a bit incredulous, so I typed "1949 nesco roaster" into the search engine, and behold!
Our roaster is identical to the one pictured, sans cabinet, which was an optional extra. It is being pressed into its sixty-fifth year of service in giving Thanksgiving the bird.
If you bigify the picture, you may see that the National Enamel and Stamping Company asserts that this is their Golden Jubilee edition of the roaster. Think about that. These things have evidently been around since Eve was fixing dinner for Adam and Cain. Excellent appliance, well-made, and still cooking!