[a_c_s]

The watch types are really clearly differentiated though:

Sport: cheaper model, a little better for athletic activity (screen is more impact-resistant but less scratch resistant)

regular: main model, styled more like a classic watch, screen is more scratch resistant but less impact resistant

Edition: made of gold, super-expensive

The Edition watch specifically isn't going to be confused with the other two models, and the Sport/regular split seems pretty straightforward to me.