Ertel-Werk München Automatic Surveying Level - 1955 - 技術儀器 - 德國 - 1950-1960

Vintage Ertel-Werk München BNA/INA Automatic Surveying Level – Original Leather Case & Manual – c. 1955 – In excellent condition – No reserve

A beautiful and complete vintage Ertel-Werk München BNA/INA Automatic Surveying Level, manufactured in Germany around 1955. Produced by the renowned precision instrument maker Ertel & Sohn (founded in 1802), this professional optical level was designed for surveying, engineering and construction work.

The instrument features an automatic compensator (Selbsteinwägung) for self-leveling, a precision optical telescope, focusing eyepiece and a 360° graduated horizontal circle. It also retains its original De Koningh N.V. Arnhem retailer plaque, adding an attractive Dutch historical connection.

Offered complete with its original stitched leather carrying case and the original German factory instruction leaflet.

Historical Context
Ertel-Werk München was one of Germany's leading manufacturers of optical and geodetic instruments. Their automatic levels became standard equipment for surveyors throughout Europe during the post-war decades and remain highly collectible today.

Specifications
Manufacturer: Ertel-Werk München (Ertel & Sohn)
Model: BNA / INA Automatic Level
Period: approx. 1955
Origin: Germany
Materials: Cast metal, optical glass, brass and leather
Included: Instrument, original leather case and original instruction leaflet
Approx. dimensions: h 17 × w 11 × d 8 cm
Approx. weight: 2 kg (including case)

Condition
In excellent vintage condition with only light signs of professional use. The optics appear clear, and the focusing mechanism, adjustment controls and horizontal circle operate smoothly. The leather case is structurally sound with an attractive aged patina, while the original manual shows expected wear from age.