It's called "Tourbograph"....
By: KIH : April 5th, 2014-11:48
.. and in PT, which is, IMHO, far, far better than the more recent HG one.... LE of only 51, and this one has the very special number for a very special Lange customer.... can't say more..... And the "whipping" of the chrono hands when they come back to Z...