Inspired by boeings progressive twin engined model 247 airliner from the 1930s bremonts unique chronograph has two sub dials that reflect the aircrafts radial engines like the model 1 ti gmt timepiece the case is available in manufactured from boeing aviation grade ti 6 4 titanium the bremont trip tick case construction incorporates a screw down crown and chrono pushers the model 247 also features an exhibition sapphire crystal case back through which the automatic chronometer movement