
On the inside of the caseback will be found the Vacheron & Constantin name and Maltese Cross (A).
On pre-1950 models there will be a six-digit case serial number (B).
Those after 1950 will also have a reference / model number (C).
Cases of precious metal will also display the casemaker's responsibility mark (D), the Helvetia symbol of Swiss manufacture (E), and assay marks for purity (F).