VINTAGE Liquid Filled LENSATIC Precision Pathfinder Engineer COMPASS Metal Case

VINTAGE Liquid Filled LENSATIC Precision Pathfinder Engineer COMPASS Metal Case. The liquid is still in it. It also looks to have a glow in the dark feature inside. The dial inside moves freely. Not sure how this compass works. Lensatic compass, often referred to as a military compass due to its use by organizations like the U.S. Military. Key features and uses:
Design:
It typically consists of a cover, a base, and a reading lens. The cover protects the compass and incorporates a sighting wire for directional determination.
Lensatic Feature:
The term "lensatic" comes from the lens on the rear side of the compass, which aids in the orienteering process and folds out to assist in reading the compass dial.
Stability:
The base includes a thumb loop designed to provide stability and help achieve more accurate readings.
Functionality:
It can be used similarly to a standard compass for finding cardinal directions, and also for more precise navigation when used with a map, allowing for acc