Leif Engberg's Leica MP-36 was sold on eBay for $104,000. Only 138 black versions of this Leica MP were produced, with 311 chrome versions. They were made between 1956 - 57, specifically for photojournalists.
M-Objektive // Leica M // Fotografie - Leica Camera AG
Leica M3D Camera Used by David Douglas Duncan, Picasso's Photographer, Sold for $2,660,000 http://www.photography-news.com/2012/11/leica-m3d-camera-used-by-picassos.html