It shows all the large parts from a G-Sonnar 90mm lens. The most difficult part
of taking apart the lens is to separate the lens head from the casing, you have to
unscrew two places which make the lens head move straight without rotation.
The rest is easy, however you cannot make the lens back to the original shape.

The left most one(@green letter) is mount metal common to all Contax G-lenses.