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This is an authentic vintage micrometer survey target manufactured by the renowned Keuffel & Esser Co. of New York. K&E was a premier American maker of precision scientific instruments for over a century. This target (Model 81-0239) was designed for high-precision elevation measurements when used with a Philadelphia leveling rod.

Key Details & Features:

Authenticity: The reverse side is clearly stamped with the maker's mark "K.& E. Co. N.Y.", confirming its pedigree and historical value.
Precision Measurement: Features an integrated vernier scale that allows a surveyor to read elevations to a precision of .001 foot.
Hardware: Includes the original, large brass thumb screw on the back, which is used to securely clamp the target at any position along a leveling rod.
Visibility: Retains its classic red and white high-visibility quartered pattern, designed to be easily spotted through a transit or level telescope from long distances.