Note that oil filled compasses of any type may have tiny bubbles appear and disappear over time. This is a natural result of changes in altitude and barometric pressure in your area of use. These tiny bubbles, if they do appear, do not affect the accuracy or function of the your compass in any way.
Carrier Body: Silicone with UV Inhibitors
Case Gasket: Silicone with Glow in the Dark Pigment
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