Are any medieval blockwerk organs in existence. If there is one, is it playable. Thank you?

Question

these were large church organs with Mixtures stops tuned in pythagorean

Answer 1

this might be one... I've seen it while traveling through Romania. I know for sure the church, called the Black Church and situated in a city of Brasov was built around XIV when the blockwerk organs were a trend. it has about 4000 pipes and yes, it's still playable.

http://lh6.ggpht.com/_OpyEvOBPT5c/Rw3t4f...