Here's mine...Superman 19 from Nov/Dec 1942. One of my grandparents wasn't 1 yr old yet.
This book was found sandwiched in a stack of term papers which in turn were packed in a wooden chest in an attic - for decades. Apart from the spine roll, the rest of the book is in great shape.
I got a #37 last month and am really hoping to get a Top 10 issue later this year....