What in the world is this material? Fiber or composite shingle?

I have not seen this and wondered if anyone can give me any insight into what this is? It appears to be a wood composite almost like a particle board type material thats molded to look like a wood shingle. Never seen it and wondering if anyone might have information about what it is, etc.

Thank you


Possibly Masonite Woodruf shingles.

https://inspectapedia.com/roof/Fiberboard_Roofing.php

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High resolution image of the end-grain would be helpful.

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