Перерыл все. Я так понял, что Lang & Heyne, это по настоящему " сделанные вручную" часы.
Как правильно сказал Андрей, c Унитасом njkmrj общая архитектура. Все детали заменены на сделанные Марко Лангом.

Вот, что говорит один из часовщиков Lang & Heyne

These is original based on Unitas, but with the time there are so many changes that it is an own caliber. For example the Entraxe between second and minute are different to Unitas. A short list what actually is produced in House (no only change Unitas Ebauche parts! It is made from new!):

Bridges and Plates, Screws, Pignons, Steel parts from the winding mechanism, chatons, hacking second, balance, ancre, Breguet spiral, the complete Chrono mechanism with wheels...

Also the case and the hands are in house-production...

So the first idea was based on Unitas, but now...

Вот посмотрите. ( переводить не стал, я и по русски не знаю этих слов )

Used to be yes, he was modifying Unitas movement/parts to meet his specs, but since he realized it will take almost same or even longer to do so, mind as well making them out of sctarch.

Here are some his parts picture i took a year ago. Here's Unitas part transformed to his spec





result




Ratchet wheel of the barrel


Again here's result.



He uses "silver powder" and just polishing it one by one...



Even hair spring is hand made.



This is the moon disk for his perpetual, again he cut out himself



Even hands...



And polish it



Even screws, he said used to buy them, but now he's making them himself, and blued with this old fashion tool under the burner



Here's an another proof that no longer use parts from Unitas, he admit using CRC (which he thinks cheating in his mind by using of modern machine against the old watchmaking tradition, but




I think Marco is a last watchmaker who makes everything by himself existed now these days



И вот различие между двумя часами сделанными на калибрах, показанных в первом сообщении Lang & Heyne и Dornblueth

That's a reason why when D.Dornbluth & Sohn can crank up and finished 30, while Marco may still working on his second watch ;-)

Несколько фоток часов Lang & Heyne