Condensation can appear in any watch and is caused by a sudden change in temperature i.e. when a watch is removed from a cold room and placed into a warm room, or vice versa. The appearance of condensation does not mean the watch will not operate but it should be checked by us. A watch exposed to sea water should be washed well in fresh water and wiped dry.
Batteries in water-resistant watches should be replaced by us so that the seal can be checked and renewed if necessary, otherwise the watch may no longer be guaranteed water-resistant. Water-resistance is not a permanent condition. For example, the gaskets that are around the stem, case back and glass will deteriorate with time and should be inspected and changed periodically. It is good practice to change the battery hatch or case back gaskets whenever the battery is changed.
You can download the instruction booklet for your watch here. Instruction booklets are published for each type of watch movement. A watch movement is the mechanism inside the watch responsible for keeping time. Types of watch movements are known as calibres. You will need to know the calibre number for your watch in order to download the correct instruction booklet.