The Bremont Boeing Model 247 Titanium GMT represents the debut chronograph in the collaboration, named after the first Boeing twin-engine commercial aircraft. The two twin-like sub-dials tastefully reflect this inspiration. The Model 247 case is manufactured from Boeing aviation-grade Ti 6-4. This is a special titanium that is significantly stronger than commercial titanium and used widely in both airframes and engine components. l. The hardened case incorporates screw down crowns and chrono pushers, together with an exhibition sapphire crystal case back.