I hope I can see that Leiden barung in person one of these days.
When I went to Spain last September, I was actually planning to go to Leiden, too. But I ran out of time -- that is, money So I'll do it next time, as circumstances will allow.
Well Lorenz, it is not that you would find actually all this stuff in the expositions in the museum. Most of it is not accesible for public unfortunately.