Welcome to the boards!
If the case is not air tight there is always a chance of corrsion. Generally, good quality
silver (and gold) coins do not corrode though a patina
can form over the years. If bad quality
(ie. an alloy
), a fouree
then of course something bad could occur.
Bronze will corrode though many coins have a protective patina
already formed which will help
A case will be great to protect the coins from physical damage though if the coins move around inside whilst you travel it may not protect them from rub wear.Hope
- actually other articles already in this section on this if you look through.