Christie's press release Christie's Voyage to Another World: The Victor Martrin-Malburet Photograph Collection includes the following:
Lot 345, The only photograph of Neil Armstrong on the Moon, July 16-24,1969. BUZZ ALDRIN [APOLLO 11]. Estimate: £30,000-50,000
But who is this (center of cropped image), where are they, and what is the name of the process by which this image was recorded? Is Christie's press release somewhat less than 100% correct?
note: Facts and citations please! No options sought here. The nature of the image in question can be ascertained through facts and citation of factual sources.
See also What's the story behind this Apollo-era image?
Cropped from NASA AS11-40-5903 found and described here and presumably on one or more NASA photo archive sites as well.
slightly related Why were contact sensors put on three of the Lunar Module's four legs? Did they ever bend and stick out sideways?