A mirror polish on front and unpolished on back and inside edges. The last two pictures are of the back side unpolished. Your can see a small opening in the front right about at the position of a mouth opening. This is a natural break out as shown in 8th picture of inside edges.
Most likely happened during cutting. This is Cypress Petrified Wood from Vantage Washington, 16 million years old. There is a small clear label stating type of wood and location on front side that can be peeled off if you wish. The item "One of A Kind in The World Devil Image in Petrified Wood Bookends" is in sale since Friday, October 5, 2018. This item is in the category "Collectibles\Rocks, Fossils & Minerals\Fossils\Vegetation\Petrified Wood".The seller is "wandsandwalkingsticks" and is located in Shelton, WA. This item can be shipped to United States.