When we evaluate a watch, one of our key criteria is clarity. Things like: Is the watch legible? Can you read the time in an instant? But clarity isn’t everything. There’s something to be said for mystery, and for artful concealment. And that’s exactly what makes the Montblanc Heritage Spirit Perpetual Calendar Sapphire so appealing. On the one hand, this watch lays itself bare, showing off the innermost working of the perpetual calendar complication. On the other, the use of a smokey sapphire dial adds just the right amount of ambiguity. The result is compelling. And, for an RRP of $30,890 in 18k red gold – so’s the price.