Watermark Tray Makes Identifying Stamps a Breeze Easily find watermarks on your stamps with this convenient tray.  The impact-resistant tray is black, so identifying your watermarks is easy.  Plus one corner features a pouring lip, so you can easily return any unused fluid to the bottle without any mess.  And it’s durable enough to last as long as your collection.  Start identifying watermarks on your stamps the easy way – order now.