Nancy Drew Printing Plate Collectible - Tandy Frontispiece

I recently acquired this Nancy Drew collectible item - it's a copper printing plate that was used by Kingsport Press to print the glossy frontispieces for The Mystery of the Brass-Bound Trunk. This image was drawn by the first Nancy Drew illustrator, Russell H. Tandy.

Here's a flipped horizontal/negative of the image to give you an idea (thanks to Sleuth Jarrell for creating this!)...

There is some wear/aging to the plate as you can see in the image - will need to see if this can be restored.