Oh man, this will be fun..... I have a million of these. Some even work.
To keep the clear plastic dome on the
compass from crazing and clouding, apply a liberal coating of mineral oil very month or so (whenever it looks dry). New
compasses will stay new nearly forever. Minor crazing on older
compasses will disappear. For winter storage, apply an extra heavy dose and wrap the
compass with a plastic bag. In the spring, the oil will still be there and the
compass will look great. Better than spending $700 on an offshore
compass. Been doing this for 30 years.... time proven.