I am not familiar with flandad, is he a trusted dealer? As far as plated watches, I am not a big fan. They'll eventually wear after time. I have a plated watch and it wearing off near the crown after hand winding. I understand that gold wrapping is better than gold plating because it is thicker and gives a truer colour. But one scratch on either plated or wrapped plating then it is game over for the watch. You may not want to wear it again.
Here is a red gold plated 15450. Yellow gold is also available.