The two Vichy plaques are not for sale but, I may be willing to part with one should the right piece come along...
,,,and just by reading the 1890's article at ChipGuide found by Pascoal, should give you an idea as to how rare they are where even the reporter had no idea they existed when he was reporting and rubbing the inventory and I would think if management wanted him to know what was going on, they would have informed him... but he tried.