This is an un-cut, un-painted, all metal, sheet of 12 original Icons Star Wars Lightsaber plaques (including 6 Skywalker and 6 Darth Vader), with ink test markings made by the Icons creative and art department during the final stages of prop replica plaque design and development.
As you can see, the Vader plaques are some kind of prototypes or early design plaques as the final ones didn't retained the "S" after Vader's name.