: What is the procedure to open it ?
: If I remember, it's a bit special on these bunds.
: I need to remove pushers and crown to access to the movement ?
: Is there a special trick to know ?

: Thanks :)
just remove the screws and then push( gently ! ) on the glass : the glass moves down the movement and so you can easily open the watch.
but be careful with the screws : it's better to give this work to a watchmaker ( at least for the first time ).