Second half of 19th century, Philadelphia, signed on its engraved silvered steel dial; the platform is affixed with two levels, two sighting posts and a socket mount; included is the instrument's wooden post for field use.

6 in. dial; 13.75 in. long; 49.5 9n. HOA on post

Original brass patina throughout; some stains to dial; drying cracks to wood; needle position is fixed.