Checkout this Iron Samurai Watch by Chinavasion which hides the time until you tap the right side buttons that then reveal the time in glowing lava like numbers, hours above minutes.
In fact, when you start wearing this watch you may find yourself spending all your time challenging strangers to duels. You will probably live by the Bushido code of Rectitude, Courage, Benevolence, Respect, Honesty, Honour, and Loyalty. You’ll start reading kanji and reciting Haiku by Basho such as “even a horse / arrests my eyes—on this / snowy morrow.” Yes, The Iron Samurai has been known to increase its wearers’ strength, dexterity, constitution, intelligence, wisdom, and charisma by as much as 20 points each!
If you want one the Iron Samurai Watch is available to buy from Chinavasion for approx $15