I’m an IWC BP fan as you already know but man these Type 20s are stunning and especially without the date display window that ruins the dial layout. Plus these cathedral hands are just marvelous and very well executed.
Usually bridges are made of brass and rhodium plated to have the white color. So basically if they remove the scratches the plating will also be removed. They will surely replace the scratched parts with new ones. The person who worked on your watch is definitely a car technician and not a skilled w