Wristwatch by the brand Constantin Durmont. This wristwatch has a genuine 'one minute flying tourbillon'. A tourbillon is a special and hard to manufacture complication which ensures that a movement keeps the time better. Additionally, the hand (between the 1 & 2) indicates how many hours the watch will function for. This is called a power reserve indicator. The watch is in beautiful condition and, naturally, the movement keeps the time perfectly. The case is made of gold-plated stainless steel, the glass is made of sapphire crystal. The diameter of the watch is 40 mm excluding the winding crown. Its weight, including the leather strap, is 92 grams. This unique watch will be sent well-packaged in a sturdy box. Will be shipped worldwide with insured shipment.