My Habring2 COS is a stealth Chrono in the absence of pushers, but not quite as stealth as their COS ZM. Still a very fun watch and ingenious way to activate, stop and reset a chronograph.
Next is a borrowed watch from fellow Purist Tim Jackson. If only I had worn this on my right wrist, covering up the annual calendar and chronograph seconds hand I really would have had a compelling stealth argument.