Vacheron Constantin, SIHH 2018Johnny McElherronNovember 27, 2017 Vacheron Constantin Overseas Dual Time In the run-up to SIHH 2018 details of the new Vacheron Constantin Overseas Dual Time models have just been announced. Vacheron Constantin, SIHH 2018Johnny McElherronNovember 27, 2017