are all three watch designs available in the same colors?
you really dont need a database with such a small data set. With only three items, you would be better of creating a static store.
Create three pages, one for each product.
In the eCart object, create a new column for Color, check the unique attribute.
In each of the thee pages, you will add an eCart add to cart button. On the bindings panel, select each cart column and enter the information for that particular watch.
For the color column, select the Updateable form Select list option.
You can then populate the list with the colors that the watch is available in.