Reference IW3713-13 is a precious-metal version of IWC's Pilot Doppelchronograph, shifting the model's technical focus into a more formal register. Its 42mm yellow gold case, black dial, and alligator strap give it a warmer take on the usual pilot-watch look. The automatic movement combines chronograph and calendar functions in a straightforward layout. At 16.2mm thick, it has the broad, substantial profile collectors expect from this model.