This model comes pretty close to the original. The power reserve works perfectly. I even believe it has more power than the original. The only obvious difference on the dial is the date lying lower than the original. And the power reserve is slightly placed lower. And on the back the fact that this is no. 1 of the 250, which makes it less to believe it's an original. The steel version is made in an amount of 1179 pieces. The whitegold version is made in an amount of 250. But all in all it is a great watch. Do buy!