The retractor structure looks like Woodpecker is IWC bracelet following 8X (89 patients) series after the 1950 launch of the 85 series of automatic winding drive mechanism, for example, 852 in 1952 and 8521 (calendar), it demands of efficiency, by taking action almost enough to make the watch keep running.
The series life there are many models compete with 8531,8541 species, such as R-1570, O-561 Etermatic (ie 2892), Eta 2824 predecessor models, JLC-883 (6), etc., are not on the transmission efficiency has a special inking or deal with, because of little significance in practical applications, after pick up the stansteel watch no matter the second hand run or not , all first to do is self-winding the refining (rotation of 40 below), so watch enough to run with energy, to maintain its stability and show the accuracy. Woodpeckers of the structures has been validated 50 years, not necessarily money than his fragile or easy to wear. Watch used after wear 25 years the different is meaningless; IWC emphasis on the permanent supply of permanent service, replace the original manufacturer of the new Woodpecker without problems.