These are some early photographs I took. The photographs below shows the movement fitted to the Montblanc Timewalker Big Date reference 36939. The movement is Montblanc caliber 4810-906. It is an ETA 2892A2 with a DD big date module based movement.
The movement is small in the 42mm case.
The ETA signed movement.
Case back is held by 6 screws. Water resistant to only 3 ATM.
The Montblanc signed rotor.
The case back. Note the unique gasket.
Closer view of the gasket.