Antique Swans Down Cake pan c. 1923. This beauty has great patina and is in great vintage condition. The angel food cake pan definitely shows signs of age and wear which make it even more appealing. The side vents open and close and are embossed Swan's Down Cake Pan Pat. Dec 1923, E. Katzinger Co. Chicago. It is still a functional pan and can be used to bake or display in your Vintage Kitchen.