Eschenbach Galilean for Distance 3x 23mm Binoculars

Fine condition; fully functioning.  These are only for viewing items from approximately 70cm or 3 feet away to infinity and are not for up close viewing or reading as a lupe would be.  Scarce model #1634 for distance from Eschenbach, a premier German manufacturer of vision aids and binoculars.  These 3x magnification binoculars feature small, lightweight scratch free lenses on a straight eyeglass frame and allow for hands-free viewing while offering a bright image.  They consist of a plus objective lens and a minus ocular lens.  Great for bird or nature enthusiasts, hunters, fisherman, or the visually impaired.
 
The frame is easily adjustable to allow for inter-pupillary distances from 54mm to 74mm; may be locked in place by tightening the two screws for each bar.  Frame also features cold bend wire-core 150mm temples and an adjustable open saddle bridge.  Light, yet substantial, solid design with smooth, effortless focusing.  Includes black zippered pouch and print of instructions in English.  As shown.  Made in Germany.  Insured post.

Lens Material: Achromatic Lens System
Focal Range:    70 cm
Visual Field:    9.5 Degrees
Field of View:   390 ft. at 1,000 yds.
Exit Pupil:     5.75 mm
Close Focus:     2.3 ft.
Prism Material:     BaK-4
Weight:   2.8 oz.
Eye Cups:     Rigid Rubber
Design Type:     Porro Prism