Mine is the same size frame as the Ebay one.
My Sherpa is size 610S. But for the Nomad Mk II where they did not make "S" frames, I got a slightly smaller frame size, 590M to get a shorter top tube because I wanted drop bars.
I think he has more seatpost showing than I do, but I still have a lot. But I did not exceed the max height markings on the post.
In the end I realized I was quite fortunate to get that size, as it is really tight to pack in the S&S case, a larger size might not have made it into the case.