Ok I'll take a stab, Its an iron, you put hot coals in it. This is just a guess, i really have no idea.
Ding! Ding! Ding! We have a winner! I had to get ahold of the Smithsonian Institution for the answer, when a friend gifted me with this, several years ago. How did you know?
I didnt know it truly was a guess.. I could see the inside looked to be melted. It takes alot of heat to melt metal. So from that I thought ...heat....coals...iron? Makes me feel good that I got that right because in an early post today you had to find the man in a bunch of coffee beans, it took me about 10 minutes and you should be able to find him in less than a minute or your brain doesnt work. My brain I guess is just geared for sewing not finding a man!...LOL
OK, did I miss it somehow? Where did this originate? What a unique thing to have just to look at and maybe appreciate our Rowentas more, even if they leak.