This is amazing, but I find it disappointing that the NYSE (current owner) hasn't collected interest on it since 2004. Given that most of the charm is that this is still an active financial document, I don't understand why they wouldn't keep it going. Otherwise it's just another defunct historical document.
The article is about them collecting interest a couple weeks ago on the 400th anniversary? They clearly are keeping it going, just only collecting interest irregularly at PR milestones.
Moving such a document is extremely risky and a lot of work so not worth it in almost any case short of the PR bump/curiousity of having the "world's oldest bond"
Given this, we should be thankful that the NYSE is maintaining this at a loss. It occurs to me that NYSE might be the best owner of this bond, as the primary value isn’t monetary, but the demonstration of stable financial institutions.