Originally Posted by Zaphod Beeblebrox

That's part of what threw me off. I had a Bridgestone pass through my hands a couple of summers ago that had such a seat post. On the one I had it looked just like a standard Steel Seatpost with no built-on clamp and there was a nut at the top of the post to tighten the expander.

The bike in the OP appears to have seat clamp ears.