That would be quite a pinnacle for a Sixten pipe. Sixten is about the only carver for whom I'd go 4 figures, and a low four figures at best, because he is, to my thinking, the single most influential carver of the 20th century, and thus plays to my interest in the history of pipes. That said, I need to keep to a budget, so I'll admire from afar. It's pretty much a given that most of this stuff will be worthless in a few decades.I have seen a Sixten Ivarson for sale on ebay for over 29000 USD a couple of years or three ago.
Also one Bo North in mor than 25000 USD