I recently assembled a GMT watch with a water resistance rating of 20 ATM, or 200m. The caseback has a gasket, but there is no gasket for the screw down crown so I’m worried about taking this into any kind of water. Most watches I’ve seen with a screw down crown and a water resistance rating of 200m or more have a gasket protecting the crown.
Does anyone have any light they can shed on this? Anybody have experience with their GMT’s in water for a swim, etc?
Also, does anyone know if a gasket can be added to the crown to improve water resistance?