I got one of those vacuum seal freezer bags and the accompanying air suckingtool from WALMART the other day and was playing with it last night. It’s a bit difficult to align properly, but when it works it really does encase the bagged object in a hard tight skin of vacuum sealed plastic.
If I use this for metal cased watches I assume this will stop any tarnishing. I did this to a ladies quartz watch last night and it’s still ticking away merrily inside the vacuum sealed bag with the plastic tight against every part of it. If I do this to a dive watch with a screw down crown and water tight (and assumedly airtight) case is there any pressure differential issues I need to worry about that would blow out seals around the crown or damage the crystal?
In other words if the dive watch is a closed, sealed atmospheric environment to prevent water intrusion will producing a hard vacuum around it during the air evacuation process blow out the crystal or damage it somehow? Also the dive watch mechanisms are self winding rotors driving a mainspring, not quartz crystal mechanisms like the ladies watch. I assume a vacuum would not effect the mechanism.