Aha! a new interpretation. Not just what's the oldest type of instruent, but the oldest example.

Your pipes made in the 1700's are impressive, but at least one instrument beats it, apparently. Wikipedia says:

"On October 14, 2010, a 1697 Stradivari violin known as 'The Molitor' was sold online by Tarisio Auctions for a world-record price of $3,600,000 to renowned concert violinist Anne Akiko Meyers."