Paulin Surveying Aneroid Altimeter with Carrying Strap

Circular altimeter marked "American Paulin System," includes fitted round light brown leather case with carrying strap, surveying aneroid barometer, 2.75 in. needle, measures 5” in diameter and 2.75” in depth without case and 6” in diameter x 3.5” in depth with case, carrying strap on leather case measures approximately 24".
Condition Report: In generally good condition, barometer functionality unknown