This may be due to the flux used in soldering the pieces together. Around the puzzle parts is a somewhat light halo. There is a dark spot on the bottom the box, (see in photo). The item "HARRY ST JOHN DIXON, PUZZLE BOX (Arts & Crafts, Dirk van Erp, Roycroft Era)" is in sale since Monday, October 25, 2021. This item is in the category "Collectibles\Metalware\Other Collectible Metalware".
The seller is "reggaedog" and is located in Fort Bragg, California. This item can be shipped to United States.