Watches 3 Models, one of Thema should be Moonphase

Buy offer Details

Hey, were about to start a company with watches. We would like to offer our end customers 3 different models in three different colors. We would like to use Japan/Swiss Movement, what is the price difference ? Since we have our company financed by Kickstarter, we would like to order 1000 or more watches in total, which should be engravable on the backside. (see photo)
One of the three models should be the moon phase.
Thank you very much
lovis