Mr_Flibble
In Tabulas Argenteas Refero
In my photo they're lined up from left to right as a Contax I Version 4 (d), Version 5(e), Version 7 (f) when sticking too Kuc's way of classifying them.
It looks like the shutter release button collars are all factory.
The Contax I(d), Version 4, had the "Cylinder" release button, without the raised collar.
The Contax I(e), Version 5, came both with and without the raised collar around the cylinder release button.
The Contax I(f), Version 6 and 7, only came with the raised collar.
The Version 1 to 3 came with the cylinder release and a plunger style release button. None had the raised collar.
It looks like the shutter release button collars are all factory.
The Contax I(d), Version 4, had the "Cylinder" release button, without the raised collar.
The Contax I(e), Version 5, came both with and without the raised collar around the cylinder release button.
The Contax I(f), Version 6 and 7, only came with the raised collar.
The Version 1 to 3 came with the cylinder release and a plunger style release button. None had the raised collar.