Momentum TORPEDO PRO, SS, SAPPHIRE, SML, BLACK, BLACK RUBBERTorpedo Pro 29 Rubber No nonsense, no superfluous functions. The clean luminous dial is designed for maximum legibility, with a discreet diver down flag. The simplest ideas are often the best ones. Really tough on your watch? Consider upgrading to an ultra hard, sapphire crystal. This is dramatically more scratch resistant than regular mineral glass and virtually impossible to scratch, ensuring a crystal clear view of the time, year after year!