No dyna from the factory would have beds like that. But that doesn't mean it's a fake...someone may have added the snare beds because they didn't want to use the frame system, and you kind of need beds with a traditional setup.
According to Ben Strauss in the Rogers Book, the dyna did have snare beds, but they were so imperceptible that it looks like there are none.
Quoting Ben Strauss, "...The snare bed is barely perceptible...We reasoned that you did in fact need some degree of snare bed to allow the head to vibrate down and touch the snares. We used such a shallow, and gradually tapered, snare bed that you couldn't even really see it. When Joe Thompson was done with his design work on this he ended up with a snare bed that was only .004" deep." From Rob Cook's "The Rogers Book"