Vintage Warm-o-tray warming pad hot plate Currier and Ives nice graphics works

This vintage warming pad is in good condition. I have plugged it in and it started heating up. It has been used but well kept and looks quite nice. Due to its age I don’t know about actually using it but seems to be sound. The label is missing from the back. To clean this simply wipe the top with a damp cloth…do not immerse in water. (Obviously but still needs to be mentioned). Thanks for looking