I just picked up an unmarked Wagner Deep Skillet w/ Skillet Cover at an estate sale for a good price. I was looking through the red book and I see this particular skillet is said to be made in the 1920s-1930s, but then I found a page with the skillet covers and the same deep skillet cover shown on the skillet says it was made in the 1950s. Does anyone have any other information on this discrepancy? For reference it's the bottom one on page 28 of the newest edition of the red book and the bottom skillet cover on page 33.