My sister is interested in a cast iron tea kettle. I saw this one the other day for $15. She said she would like it so I got it for her. I don't see any markings and if there was ever a lid, it's without lid now. Searching on this site for "tea kettle" shows up way too many threads to view in a short time. Can anyone direct me to a thread with something similar, please? Anyone have some ideas of manufacturer or dates? Did I miss any identifying features? I have the Red and Blue Books but not the Gray Book.