You are right! Both are Chronos, and I know that! I don't know what I was thinking! Boy, now I feel really stupid! Thank you for make my Brain work and come back!! lol. I think you are right, ETA 511.xxx. That is why I can't find it. I was thinking of the Chrono. model F1. Now I will look for the right movement in this. Thanks guys!G10 and G15 movements are chronos. I don't know all the quartz movmements and as Eeeb said changes are made without notice but I "think" it's an ETA 511.xxx.