Brass Box "Pocket" Sextant ca late 19th Century U-2 An unusual feature is that

An unusual feature is that the minute hand of the stopwatch rotates counterclockwise as it counts the minutes

Very cool indeed

and some of the paint is chipped on a few surfaces

part number 2550

It is also stamped with the wing logo of Naval Air Station Alameda (CA)

Brass Box "Pocket" Sextant ca late 19th Century U-2 An unusual feature is thatThis is an original brass Box Sextant, or "Pocket" Sextant. At 3 inches in diameter and 1. 5 inches when closed, it could easily fit in the pocket of a mariner for determining position at sea or for determining horizontal positions on land. Box sextants have been around since the early 1800's. We speculate this example was made in the late 19th century. The protective outer case unscrews from the mechanism platform and screws back on to it's opposite