Bergeon 55-684 6899-AT-120 Stainless Steel Ergonomic 1.2mm Screwdriver with Spare Blades Watch Repair Kit

Question about screwdriver types, what's the benefit of the fatter swivel head vs the smaller knurled head? Is there a special way one is better?

Is this screwdriver suitable for a panerai luminor marina 44mm? i haven’t found specs about the crew size. thank you in advance!

is the head of the screw driver small enough to remove the battery screw on a invicta watch