In other words - Lange has many models with the same black+silver dial, but they only use the brown strap on this watch.
The Lange 1 moon phase white gold is the same black dial right? But they use black strap. And the saxonia moon phase too - same black dial and done sign black strap
Why brown strap on the timezone? It’s bigger so it’s therefor sporty and they thought brown strap was a sportier look maybe?