Kreamer cake pan, early 1900s vintage heavy steel with tinned finish inside and out. This one is marked Cake (and something) right around the inside of the pan in a dark pencil - I don't think it's ever been used, though it has a few rust spots.
This measures 4" deep x 9" across the rim. It's made in one piece, tube does not lift out like a more modern cake pan. No springform sides, so it's great for puddings. Kreamer is best known for their pudding molds, after all!