Hi Rryan - great to see you around after a longish sabatical
Yes, it was click wear on the reduction wheel of the winding system that Kreutzer and I think Hampel have both mentioned. But I believe that was only a problem with neglected movements. In well serviced movements it appears not to have been such a bother. It was also an issue with the early 500 movement series (501 - 505)
The 470 also was more than often a US option because it complied with the cheaper import 17 jewel import duty cap, whereas the 471 had 19 and then 20 jewels and attrcated a higher duty on all jewels.
