Sorry! By 'shadow lines' I mean the lines that are created between, for example, the crystal, bezel, main body and case back of a watch when there appear to be spaces between them ...
Architects often use 'shadow lines', which look like narrow trenches, around doors to give visual interest. In many watches, there are 3. Crystal to bezel, bezel to case, case to case back. Commonly, though, there are 4 when there is a crystal case back. ...
