The three main reasons I think it is re-backed are:
1. The left edge - (it looks like the left edge was scraped across concrete or something, which is what you would do if you wanted to hide the fact that the front and back were different pieces of cardboard, and didn't align perfectly).
2. The back has a number of spots of staining, all near the edges. It looks to me like some spots have staining where the back had more wear and as a result the paper is thinner. The adhesive used to bind front to back may be showing through the thinner spots on the back, leaving a stain.
3. The wear just doesn't look natural. The edges on the back look like they were artifically worn with sandpaper or something to make them too rough to detect if they are two separate pieces of paper.
I'm by no means an expert on the topic, but that's what it looks like to me.
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