This is a Fairchild K-6 lens 20" created circa 1927/1930, as the one used by Brad Washburn in Alaska in 1937.
Around 50 Lbs with lens.
https://alaskasportshall.org/inductee/bradford-washburn/
http://www.doublexposure.net/the-artists/
https://www.nhmagazine.com/the-man-who-mapped-nhs-white-mountains/
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