This came as quite a surprise as i hadn't heard about this model before and chanced upon it whilst visiting the VC Geneva boutique over the week end.
Vacheron Constantin has made 4 special automatic Patrimony models without date (a model not within the VC catalogue as all automatic Patrimony models come with a date at 6). 25 pieces in white gold and 25 pieces in pink gold. Within these 25 pieces in each metal, 12 have a cream dial and 13 with a slate grey dial.
These models are actually rebirths of the ref 86180, a reference unfortunaley rapidly abandon after indtriduction. I love the Patzrimony dial but always found it a shame to have the date aperture ruin such a good looking dial and the Geneva boutique edition really hit the nail on the head for me :-)