8F Upgraded version V3 version 8F boutique: Vacheron Constantin Overseas watch took 10 months to create a fine stainless steel case, diameter 41mm, sapphire crystal back, 9015 modified automatic winding machine, swing frequency 28800 times/hour, stainless steel buckle, water-resistant. The last thing I must appreciate is the new "interchangeable strap system". The new Overseas can be replaced by just turning a small lever between the strap and the lug. For watch straps, each one can choose a steel strap or leather strap, truly achieving a 1:1 replica.