I'm thinking of bidding on this pan. I think I found it on p. 14 of the Red Book; if so, it was manufactured in 1924. The only difference I see is where the handle joins the pan wall--no triangle in the RB photo. The one on p. 15 has the triangle, but it doesn't have the outside heat ring.
https://flic.kr/p/QRxtpu
https://flic.kr/p/QRxtpu