ctmoa

I don't understand why i haven't succed whith this small button. But you are right. It is this button. Thanks for your help. For the 'crap' on the watch, it is because i have brushed the case. And it seems that some 'crap' rest was on the cloth where i put the watch. And maybe static electricity have made this. After taked picture, i have blowed on it, and it seems to be ok.

Hello. I would have to know what is this movement type or name (it is for a breitling navitimer tricompas 6-9-12). And more important, how can i remove the crown ? Because there is no hole near the crown where i can push to remove the crown. (and if you have the complete process to remove this movement, it will be perfect). Thanks for your help. Picture :