3M also tested plates here in WA for WSP. They were, in large, a failure.
The Troopers clung onto their old ones and still run the stamped plates today for WSP. The font/spacing seemed to be off slightly as well depending on the batch.
Sample seen here (on the Expedition half way down the page):
http://www.statetrooperplates.com/wasp.htm
Similar to what is now used for the personalized plates in WA: